求万恶的电子邮件正则表达式

[ojekleen]

"^[a-zA-Z0-9_\\-]{1,}@[a-zA-Z0-9_\\-]{1,}\\.[a-zA-Z0-9_\\-.]{1,}$"
"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"

以上两种就不要复制了，
要个经得起万恶的旧社会考验的。
谢谢啊。
举2个可能会出现的例子

@[e-mail]
[e-mail].
[e-mail].
[e-mail]@cn
[e-mail]@163.cn

各种可能都有，谢谢！

[root_]

微软封装System.Net.Mail程序集里有一个类为MailMessage 类里有个字符串集合属性To 当然该集合有add();方法。
当非法电子邮件地址添加的时候就会报错“非法电子邮件地址”。我只是想知道有没有正则可以和微软的验证方式匹配。
－－－－－－－－－－－－－－－－－－－－－－
这种事去问盖茨吧


或许我什么都不知，但是你给的的确有不能区别的。
--------------------------------------
这个当然不是万能的，否则正则的存在也就没意义了，如果你说不出规则来，你把不能匹配的列出来啊

[zzPandazz]

我比较想慰问那些正则的解释程序

[glutton]

推荐文章：正则表达式30分钟入门教程
http://unibetter.com/deerchao/zhengzhe-biaodashi-jiaocheng-se.htm

[r_swordsman]

[Quote=引用 49 楼 ojekleen 的回复:]
微软封装System.Net.Mail程序集里有一个类为MailMessage 类里有个字符串集合属性To 当然该集合有add();方法。
当非法电子邮件地址添加的时候就会报错“非法电子邮件地址”。我只是想知道有没有正则可以和微软的验证方式匹配。
或许我什么都不知，但是你给的的确有不能区别的。
[/Quote]

public void Add(string addresses)
{
if (addresses == null)
{
throw new ArgumentNullException("addresses");
}
if (addresses == string.Empty)
{
throw new ArgumentException(SR.GetString("net_emptystringcall", new object[] { "addresses" }), "addresses");
}
this.ParseValue(addresses);
}



internal void ParseValue(string addresses)
{
for (int i = 0; i < addresses.Length; i++)
{
MailAddress item = MailBnfHelper.ReadMailAddress(addresses, ref i);
if (item == null)
{
return;
}
base.Add(item);
if (!MailBnfHelper.SkipCFWS(addresses, ref i))
{
break;
}
if (addresses[i] != ',')
{
return;
}
}
}

[r_swordsman]

 
internal static class MailBnfHelper
{
    // Fields
    private static bool[] s_atext = new bool[0x80];
    private static string[] s_days;
    private static bool[] s_digits = new bool[0x80];
    private static bool[] s_dtext = new bool[0x80];
    private static bool[] s_fdtext = new bool[0x80];
    private static bool[] s_fqtext = new bool[0x80];
    private static bool[] s_ftext = new bool[0x80];
    private static string[] s_months;
    private static bool[] s_qtext = new bool[0x80];
    private static bool[] s_ttext = new bool[0x80];

    // Methods
    static MailBnfHelper()
    {
        string[] strArray = new string[13];
        strArray[1] = "Jan";
        strArray[2] = "Feb";
        strArray[3] = "Mar";
        strArray[4] = "Apr";
        strArray[5] = "May";
        strArray[6] = "Jun";
        strArray[7] = "Jul";
        strArray[8] = "Aug";
        strArray[9] = "Sep";
        strArray[10] = "Oct";
        strArray[11] = "Nov";
        strArray[12] = "Dec";
        s_months = strArray;
        s_days = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
        for (int i = 0x30; i <= 0x39; i++)
        {
            s_atext[i] = true;
        }
        for (int j = 0x41; j <= 90; j++)
        {
            s_atext[j] = true;
        }
        for (int k = 0x61; k <= 0x7a; k++)
        {
            s_atext[k] = true;
        }
        s_atext[0x21] = true;
        s_atext[0x23] = true;
        s_atext[0x24] = true;
        s_atext[0x25] = true;
        s_atext[0x26] = true;
        s_atext[0x27] = true;
        s_atext[0x2a] = true;
        s_atext[0x2b] = true;
        s_atext[0x2d] = true;
        s_atext[0x2f] = true;
        s_atext[0x3d] = true;
        s_atext[0x3f] = true;
        s_atext[0x5e] = true;
        s_atext[0x5f] = true;
        s_atext[0x60] = true;
        s_atext[0x7b] = true;
        s_atext[0x7c] = true;
        s_atext[0x7d] = true;
        s_atext[0x7e] = true;
        for (int m = 1; m <= 8; m++)
        {
            s_qtext[m] = true;
        }
        s_qtext[11] = true;
        s_qtext[12] = true;
        for (int n = 14; n <= 0x1f; n++)
        {
            s_qtext[n] = true;
        }
        s_qtext[0x21] = true;
        for (int num6 = 0x23; num6 <= 0x5b; num6++)
        {
            s_qtext[num6] = true;
        }
        for (int num7 = 0x5d; num7 <= 0x7f; num7++)
        {
            s_qtext[num7] = true;
        }
        for (int num8 = 1; num8 <= 9; num8++)
        {
            s_fqtext[num8] = true;
        }
        s_fqtext[11] = true;
        s_fqtext[12] = true;
        for (int num9 = 14; num9 <= 0x21; num9++)
        {
            s_fqtext[num9] = true;
        }
        for (int num10 = 0x23; num10 <= 0x5b; num10++)
        {
            s_fqtext[num10] = true;
        }
        for (int num11 = 0x5d; num11 <= 0x7f; num11++)
        {
            s_fqtext[num11] = true;
        }
        for (int num12 = 1; num12 <= 8; num12++)
        {
            s_dtext[num12] = true;
        }
        s_dtext[11] = true;
        s_dtext[12] = true;
        for (int num13 = 14; num13 <= 0x1f; num13++)
        {
            s_dtext[num13] = true;
        }
        for (int num14 = 0x21; num14 <= 90; num14++)
        {
            s_dtext[num14] = true;
        }
        for (int num15 = 0x5e; num15 <= 0x7f; num15++)
        {
            s_dtext[num15] = true;
        }
        for (int num16 = 1; num16 <= 9; num16++)
        {
            s_fdtext[num16] = true;
        }
        s_fdtext[11] = true;
        s_fdtext[12] = true;
        for (int num17 = 14; num17 <= 90; num17++)
        {
            s_fdtext[num17] = true;
        }
        for (int num18 = 0x5e; num18 <= 0x7f; num18++)
        {
            s_fdtext[num18] = true;
        }
        for (int num19 = 0x21; num19 <= 0x39; num19++)
        {
            s_ftext[num19] = true;
        }
        for (int num20 = 0x3b; num20 <= 0x7e; num20++)
        {
            s_ftext[num20] = true;
        }
        for (int num21 = 0x21; num21 <= 0x7e; num21++)
        {
            s_ttext[num21] = true;
        }
        s_ttext[40] = false;
        s_ttext[0x29] = false;
        s_ttext[60] = false;
        s_ttext[0x3e] = false;
        s_ttext[0x40] = false;
        s_ttext[0x2c] = false;
        s_ttext[0x3b] = false;
        s_ttext[0x3a] = false;
        s_ttext[0x5c] = false;
        s_ttext[0x22] = false;
        s_ttext[0x2f] = false;
        s_ttext[0x5b] = false;
        s_ttext[0x5d] = false;
        s_ttext[0x3f] = false;
        s_ttext[0x3d] = false;
        for (int num22 = 0x30; num22 <= 0x39; num22++)
        {
            s_digits[num22] = true;
        }
    }

    internal static string GetDateTimeString(DateTime value, StringBuilder builder)
    {
        StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
        builder2.Append(value.Day);
        builder2.Append(' ');
        builder2.Append(s_months[value.Month]);
        builder2.Append(' ');
        builder2.Append(value.Year);
        builder2.Append(' ');
        if (value.Hour <= 9)
        {
            builder2.Append('0');
        }
        builder2.Append(value.Hour);
        builder2.Append(':');
        if (value.Minute <= 9)
        {
            builder2.Append('0');
        }
        builder2.Append(value.Minute);
        builder2.Append(':');
        if (value.Second <= 9)
        {
            builder2.Append('0');
        }
        builder2.Append(value.Second);
        string str = TimeZone.CurrentTimeZone.GetUtcOffset(value).ToString();
        if (str[0] != '-')
        {
            builder2.Append(" +");
        }
        else
        {
            builder2.Append(" ");
        }
        string[] strArray = str.Split(new char[] { ':' });
        builder2.Append(strArray[0]);
        builder2.Append(strArray[1]);
        if (builder == null)
        {
            return builder2.ToString();
        }
        return null;
    }

[r_swordsman]

    internal static string GetDotAtomOrDomainLiteral(string data, StringBuilder builder)
    {
        int num = 0;
        int startIndex = 0;
        while (num < data.Length)
        {
            if (data[num] > s_atext.Length)
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            if ((data[num] != '.') && !s_atext[data[num]])
            {
                StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
                builder.Append('[');
                while (num < data.Length)
                {
                    if (data[num] > s_fdtext.Length)
                    {
                        throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
                    }
                    if (!s_fdtext[data[num]])
                    {
                        builder.Append(data, startIndex, num - startIndex);
                        builder.Append('\\');
                        startIndex = num;
                    }
                    num++;
                }
                builder.Append(data, startIndex, num - startIndex);
                builder.Append(']');
                if (builder == null)
                {
                    return builder2.ToString();
                }
                return null;
            }
            num++;
        }
        if (builder != null)
        {
            builder.Append(data);
            return null;
        }
        return data;
    }

    internal static string GetDotAtomOrQuotedString(string data, StringBuilder builder)
    {
        int num = 0;
        int startIndex = 0;
        while (num < data.Length)
        {
            if (data[num] > s_atext.Length)
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            if (((data[num] != '.') && !s_atext[data[num]]) || (data[num] == ' '))
            {
                StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
                builder.Append('"');
                while (num < data.Length)
                {
                    if (data[num] > s_fqtext.Length)
                    {
                        throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
                    }
                    if (!s_fqtext[data[num]])
                    {
                        builder.Append(data, startIndex, num - startIndex);
                        builder.Append('\\');
                        startIndex = num;
                    }
                    num++;
                }
                builder.Append(data, startIndex, num - startIndex);
                builder.Append('"');
                if (builder == null)
                {
                    return builder2.ToString();
                }
                return null;
            }
            num++;
        }
        if (builder != null)
        {
            builder.Append(data);
            return null;
        }
        return data;
    }

    internal static string GetTokenOrQuotedString(string data, StringBuilder builder)
    {
        int num = 0;
        int startIndex = 0;
        while (num < data.Length)
        {
            if (data[num] > s_ttext.Length)
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            if (!s_ttext[data[num]] || (data[num] == ' '))
            {
                StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
                builder.Append('"');
                while (num < data.Length)
                {
                    if (data[num] > s_fqtext.Length)
                    {
                        throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
                    }
                    if (!s_fqtext[data[num]])
                    {
                        builder.Append(data, startIndex, num - startIndex);
                        builder.Append('\\');
                        startIndex = num;
                    }
                    num++;
                }
                builder.Append(data, startIndex, num - startIndex);
                builder.Append('"');
                if (builder == null)
                {
                    return builder2.ToString();
                }
                return null;
            }
            num++;
        }
        if (data.Length == 0)
        {
            if (builder == null)
            {
                return "\"\"";
            }
            builder.Append("\"\"");
        }
        if (builder != null)
        {
            builder.Append(data);
            return null;
        }
        return data;
    }

    internal static bool HasCROrLF(string data)
    {
        for (int i = 0; i < data.Length; i++)
        {
            if ((data[i] == '\r') || (data[i] == '\n'))
            {
                return true;
            }
        }
        return false;
    }

    private static bool IsValidDOW(string data, ref int offset)
    {
        if ((offset + 3) >= data.Length)
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        for (int i = 0; i < s_days.Length; i++)
        {
            if (string.Compare(s_days[i], 0, data, offset, 3, true, CultureInfo.InvariantCulture) == 0)
            {
                offset += 3;
                return true;
            }
        }
        return false;
    }

    internal static string ReadAddressSpecDomain(string data, ref int offset, StringBuilder builder)
    {
        if (offset >= data.Length)
        {
            throw new FormatException(SR.GetString("MailAddressInvalidFormat"));
        }
        builder.Append('@');
        SkipCFWS(data, ref offset);
        if (data[offset] == '[')
        {
            ReadDomainLiteral(data, ref offset, builder);
        }
        else
        {
            ReadDotAtom(data, ref offset, builder);
        }
        SkipCFWS(data, ref offset);
        return builder.ToString();
    }

    internal static string ReadAngleAddress(string data, ref int offset, StringBuilder builder)
    {
        if (offset >= data.Length)
        {
            throw new FormatException(SR.GetString("MailAddressInvalidFormat"));
        }
        SkipCFWS(data, ref offset);
        if (data[offset] == '"')
        {
            ReadQuotedString(data, ref offset, builder);
        }
        else
        {
            ReadDotAtom(data, ref offset, builder);
        }
        SkipCFWS(data, ref offset);
        if ((offset >= data.Length) || (data[offset] != '@'))
        {
            throw new FormatException(SR.GetString("MailAddressInvalidFormat"));
        }
        offset++;
        SkipCFWS(data, ref offset);
        string str = ReadAddressSpecDomain(data, ref offset, builder);
        if (!SkipCFWS(data, ref offset) || (data[offset++] != '>'))
        {
            throw new FormatException(SR.GetString("MailAddressInvalidFormat"));
        }
        return str;
    }

[r_swordsman]

    internal static string ReadAtom(string data, ref int offset, StringBuilder builder)
    {
        string str;
        int startIndex = offset;
        while (offset < data.Length)
        {
            if (data[offset] > s_atext.Length)
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            if (!s_atext[data[offset]])
            {
                if (offset == startIndex)
                {
                    throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
                }
                str = data.Substring(startIndex, offset - startIndex);
                if (builder != null)
                {
                    builder.Append(str);
                    return null;
                }
                return str;
            }
            offset++;
        }
        if (offset == startIndex)
        {
            throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
        }
        str = (startIndex == 0) ? data : data.Substring(startIndex);
        if (builder != null)
        {
            builder.Append(str);
            return null;
        }
        return str;
    }

    private static int ReadDateNumber(string data, ref int offset, int maxSize)
    {
        int num = 0;
        int num2 = offset + maxSize;
        if (offset >= data.Length)
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        while ((offset < data.Length) && (offset < num2))
        {
            if ((data[offset] < '0') || (data[offset] > '9'))
            {
                break;
            }
            num = (num * 10) + (data[offset] - '0');
            offset++;
        }
        if (num == 0)
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        return num;
    }

    internal static DateTime ReadDateTime(string data, ref int offset)
    {
        if (!SkipCFWS(data, ref offset))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        if (IsValidDOW(data, ref offset))
        {
            if ((offset >= data.Length) || (data[offset] != ','))
            {
                throw new FormatException(SR.GetString("MailDateInvalidFormat"));
            }
            offset++;
        }
        if (!SkipFWS(data, ref offset))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        int day = ReadDateNumber(data, ref offset, 2);
        if ((offset >= data.Length) || ((data[offset] != ' ') && (data[offset] != '\t')))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        if (!SkipFWS(data, ref offset))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        int month = ReadMonth(data, ref offset);
        if ((offset >= data.Length) || ((data[offset] != ' ') && (data[offset] != '\t')))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        if (!SkipFWS(data, ref offset))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        int year = ReadDateNumber(data, ref offset, 4);
        if ((offset >= data.Length) || ((data[offset] != ' ') && (data[offset] != '\t')))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        if (!SkipFWS(data, ref offset))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        int hour = ReadDateNumber(data, ref offset, 2);
        if ((offset >= data.Length) || (data[offset] != ':'))
        {
            throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
        }
        offset++;
        int minute = ReadDateNumber(data, ref offset, 2);
        int second = 0;
        if ((offset < data.Length) && (data[offset] == ':'))
        {
            offset++;
            second = ReadDateNumber(data, ref offset, 2);
        }
        if (!SkipFWS(data, ref offset))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        if ((offset >= data.Length) || ((data[offset] != '-') && (data[offset] != '+')))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        offset++;
        ReadDateNumber(data, ref offset, 4);
        return new DateTime(year, month, day, hour, minute, second);
    }

    internal static string ReadDomainLiteral(string data, ref int offset, StringBuilder builder)
    {
        int startIndex = ++offset;
        StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
        while (offset < data.Length)
        {
            if (data[offset] == '\\')
            {
                builder2.Append(data, startIndex, offset - startIndex);
                startIndex = ++offset;
            }
            else
            {
                if (data[offset] == ']')
                {
                    builder2.Append(data, startIndex, offset - startIndex);
                    offset++;
                    if (builder == null)
                    {
                        return builder2.ToString();
                    }
                    return null;
                }
                if ((data[offset] > s_fdtext.Length) || !s_fdtext[data[offset]])
                {
                    throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
                }
            }
            offset++;
        }
        throw new FormatException(SR.GetString("MailHeaderFieldMalformedHeader"));
    }

    internal static string ReadDotAtom(string data, ref int offset, StringBuilder builder)
    {
        bool flag = true;
        if (builder == null)
        {
            flag = false;
            builder = new StringBuilder();
        }
        if (data[offset] != '.')
        {
            ReadAtom(data, ref offset, builder);
        }
        while ((offset < data.Length) && (data[offset] == '.'))
        {
            builder.Append(data[offset++]);
            ReadAtom(data, ref offset, builder);
        }
        if (flag)
        {
            return null;
        }
        return builder.ToString();
    }

[r_swordsman]

    internal static MailAddress ReadMailAddress(string data, ref int offset)
    {
        string encodedDisplayName = null;
        return new MailAddress(ReadMailAddress(data, ref offset, out encodedDisplayName), encodedDisplayName, 0);
    }

    internal static string ReadMailAddress(string data, ref int offset, out string displayName)
    {
        string str = null;
        Exception exception = null;
        displayName = string.Empty;
        StringBuilder builder = new StringBuilder();
        try
        {
            SkipCFWS(data, ref offset);
            if (offset >= data.Length)
            {
                exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
                goto Label_0270;
            }
            if (data[offset] == '<')
            {
                offset++;
                return ReadAngleAddress(data, ref offset, builder);
            }
            ReadPhrase(data, ref offset, builder);
            if (offset >= data.Length)
            {
                exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
                goto Label_0270;
            }
            char ch = data[offset];
            if (ch <= '.')
            {
                switch (ch)
                {
                    case '"':
                        goto Label_016C;

                    case '.':
                        goto Label_00D9;
                }
                goto Label_0211;
            }
            switch (ch)
            {
                case ':':
                    exception = new FormatException(SR.GetString("MailAddressUnsupportedFormat"));
                    goto Label_0270;

                case ';':
                    goto Label_0211;

                case '<':
                    displayName = builder.ToString();
                    builder = new StringBuilder();
                    offset++;
                    str = ReadAngleAddress(data, ref offset, builder);
                    goto Label_0223;

                default:
                    if (ch != '@')
                    {
                        goto Label_0211;
                    }
                    offset++;
                    str = ReadAddressSpecDomain(data, ref offset, builder);
                    goto Label_0223;
            }
        Label_00D9:
            ReadDotAtom(data, ref offset, builder);
            SkipCFWS(data, ref offset);
            if (offset >= data.Length)
            {
                exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
            }
            else
            {
                if (data[offset] == '@')
                {
                    offset++;
                    str = ReadAddressSpecDomain(data, ref offset, builder);
                    goto Label_0223;
                }
                if (data[offset] == '<')
                {
                    displayName = builder.ToString();
                    builder = new StringBuilder();
                    offset++;
                    str = ReadAngleAddress(data, ref offset, builder);
                    goto Label_0223;
                }
                exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
            }
            goto Label_0270;
        Label_016C:
            offset++;
            if (offset >= data.Length)
            {
                exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
                goto Label_0270;
            }
            SkipCFWS(data, ref offset);
            if (offset >= data.Length)
            {
                exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
                goto Label_0270;
            }
            if (data[offset] == '<')
            {
                offset++;
                str = ReadAngleAddress(data, ref offset, builder);
            }
            else
            {
                str = ReadAddressSpecDomain(data, ref offset, builder);
            }
            goto Label_0223;
        Label_0211:
            exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
            goto Label_0270;
        Label_0223:
            if (offset < data.Length)
            {
                SkipCFWS(data, ref offset);
                if ((offset < data.Length) && (data[offset] != ','))
                {
                    exception = new FormatException(SR.GetString("MailAddressInvalidFormat"));
                }
            }
        }
        catch (FormatException)
        {
            throw new FormatException(SR.GetString("MailAddressInvalidFormat"));
        }
    Label_0270:
        if (exception != null)
        {
            throw exception;
        }
        return str;
    }

[r_swordsman]

    private static int ReadMonth(string data, ref int offset)
    {
        if (offset >= (data.Length - 3))
        {
            throw new FormatException(SR.GetString("MailDateInvalidFormat"));
        }
        switch (data[offset++])
        {
            case 'J':
            case 'j':
                switch (data[offset++])
                {
                    case 'a':
                    case 'A':
                    {
                        char ch3 = data[offset++];
                        if ((ch3 != 'N') && (ch3 != 'n'))
                        {
                            goto Label_03B2;
                        }
                        return 1;
                    }
                    case 'u':
                    case 'U':
                        switch (data[offset++])
                        {
                            case 'L':
                            case 'l':
                                return 7;

                            case 'M':
                            case 'm':
                                goto Label_03B2;

                            case 'N':
                            case 'n':
                                return 6;
                        }
                        goto Label_03B2;
                }
                goto Label_03B2;

            case 'K':
            case 'L':
            case 'E':
            case 'e':
            case 'k':
            case 'l':
                goto Label_03B2;

            case 'M':
            case 'm':
            {
                char ch7 = data[offset++];
                if ((ch7 != 'A') && (ch7 != 'a'))
                {
                    goto Label_03B2;
                }
                char ch8 = data[offset++];
                if (ch8 <= 'Y')
                {
                    switch (ch8)
                    {
                        case 'R':
                            goto Label_021D;

                        case 'Y':
                            goto Label_021B;
                    }
                    goto Label_03B2;
                }
                if (ch8 == 'r')
                {
                    goto Label_021D;
                }
                if (ch8 != 'y')
                {
                    goto Label_03B2;
                }
                goto Label_021B;
            }
            case 'N':
            case 'n':
            {
                char ch16 = data[offset++];
                if ((ch16 != 'O') && (ch16 != 'o'))
                {
                    goto Label_03B2;
                }
                char ch17 = data[offset++];
                if ((ch17 != 'V') && (ch17 != 'v'))
                {
                    goto Label_03B2;
                }
                return 11;
            }
            case 'O':
            case 'o':
            {
                char ch14 = data[offset++];
                if ((ch14 != 'C') && (ch14 != 'c'))
                {
                    goto Label_03B2;
                }
                char ch15 = data[offset++];
                if ((ch15 != 'T') && (ch15 != 't'))
                {
                    goto Label_03B2;
                }
                return 10;
            }
            case 'S':
            case 's':
            {
                char ch12 = data[offset++];
                if ((ch12 != 'E') && (ch12 != 'e'))
                {
                    goto Label_03B2;
                }
                char ch13 = data[offset++];
                if ((ch13 != 'P') && (ch13 != 'p'))
                {
                    goto Label_03B2;
                }
                return 9;
            }
            case 'D':
            case 'd':
                switch (data[offset++])
                {
                    case 'E':
                    case 'e':
                    {
                        char ch19 = data[offset++];
                        if ((ch19 == 'C') || (ch19 == 'c'))
                        {
                            return 12;
                        }
                        break;
                    }
                }
                goto Label_03B2;

            case 'F':
            case 'f':
            {
                char ch5 = data[offset++];
                if ((ch5 != 'E') && (ch5 != 'e'))
                {
                    goto Label_03B2;
                }
                char ch6 = data[offset++];
                if ((ch6 != 'B') && (ch6 != 'b'))
                {
                    goto Label_03B2;
                }
                return 2;
            }
            case 'A':
            case 'a':
                switch (data[offset++])
                {
                    case 'p':
                    case 'P':
                    {
                        char ch10 = data[offset++];
                        if ((ch10 != 'R') && (ch10 != 'r'))
                        {
                            goto Label_03B2;
                        }
                        return 4;
                    }
                    case 'u':
                    case 'U':
                    {
                        char ch11 = data[offset++];
                        if ((ch11 != 'G') && (ch11 != 'g'))
                        {
                            goto Label_03B2;
                        }
                        return 8;
                    }
                }
                goto Label_03B2;
        }
        goto Label_03B2;
    Label_021B:
        return 5;
    Label_021D:
        return 3;
    Label_03B2:
        throw new FormatException(SR.GetString("MailDateInvalidFormat"));
    }

    internal static string ReadParameterAttribute(string data, ref int offset, StringBuilder builder)
    {
        if (!SkipCFWS(data, ref offset))
        {
            return null;
        }
        return ReadToken(data, ref offset, null);
    }

[r_swordsman]

    internal static string ReadPhrase(string data, ref int offset, StringBuilder builder)
    {
        StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
        bool flag = false;
        SkipCFWS(data, ref offset);
        int num = offset;
        while (SkipCFWS(data, ref offset))
        {
            if (data[offset] == '"')
            {
                if (flag)
                {
                    builder2.Append(' ');
                }
                ReadQuotedString(data, ref offset, builder2);
                flag = true;
            }
            else
            {
                if (!s_atext[data[offset]])
                {
                    break;
                }
                if (flag)
                {
                    builder2.Append(' ');
                }
                ReadAtom(data, ref offset, builder2);
                flag = true;
            }
        }
        if (num == offset)
        {
            throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
        }
        if (builder == null)
        {
            return builder2.ToString();
        }
        return null;
    }

    internal static string ReadQuotedString(string data, ref int offset, StringBuilder builder)
    {
        return ReadQuotedString(data, ref offset, builder, false);
    }

    internal static string ReadQuotedString(string data, ref int offset, StringBuilder builder, bool doesntRequireQuotes)
    {
        if (!doesntRequireQuotes)
        {
            offset++;
        }
        int startIndex = offset;
        StringBuilder builder2 = (builder != null) ? builder : new StringBuilder();
        while (offset < data.Length)
        {
            if (data[offset] == '\\')
            {
                builder2.Append(data, startIndex, offset - startIndex);
                startIndex = ++offset;
            }
            else
            {
                if (data[offset] == '"')
                {
                    builder2.Append(data, startIndex, offset - startIndex);
                    offset++;
                    if (builder == null)
                    {
                        return builder2.ToString();
                    }
                    return null;
                }
                if (!s_fqtext[data[offset]])
                {
                    throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
                }
            }
            offset++;
        }
        if (!doesntRequireQuotes)
        {
            throw new FormatException(SR.GetString("MailHeaderFieldMalformedHeader"));
        }
        builder2.Append(data, startIndex, offset - startIndex);
        if (builder == null)
        {
            return builder2.ToString();
        }
        return null;
    }

[r_swordsman]

    internal static string ReadToken(string data, ref int offset, StringBuilder builder)
    {
        int startIndex = offset;
        while (offset < data.Length)
        {
            if (data[offset] > s_ttext.Length)
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            if (!s_ttext[data[offset]])
            {
                break;
            }
            offset++;
        }
        if (startIndex == offset)
        {
            throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
        }
        return data.Substring(startIndex, offset - startIndex);
    }

    internal static bool SkipCFWS(string data, ref int offset)
    {
        int num = 0;
        while (offset < data.Length)
        {
            if (data[offset] > '\x007f')
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            if ((data[offset] == '\\') && (num > 0))
            {
                offset += 2;
            }
            else if (data[offset] == '(')
            {
                num++;
            }
            else if (data[offset] == ')')
            {
                num--;
            }
            else if (((data[offset] != ' ') && (data[offset] != '\t')) && (num == 0))
            {
                return true;
            }
            if (num < 0)
            {
                throw new FormatException(SR.GetString("MailHeaderFieldInvalidCharacter"));
            }
            offset++;
        }
        return false;
    }

    internal static bool SkipFWS(string data, ref int offset)
    {
        while (offset < data.Length)
        {
            if ((data[offset] != ' ') && (data[offset] != '\t'))
            {
                return true;
            }
            offset++;
        }
        return false;
    }

    internal static void ValidateHeaderName(string data)
    {
        int num = 0;
        while (num < data.Length)
        {
            if ((data[num] > s_ftext.Length) || !s_ftext[data[num]])
            {
                throw new FormatException(SR.GetString("InvalidHeaderName"));
            }
            num++;
        }
        if (num == 0)
        {
            throw new FormatException(SR.GetString("InvalidHeaderName"));
        }
    }
}

 

 

[r_swordsman]

lz研究研究吧...

[bt_lose]

我用的都是vs中提供的正则验证控件中的email正则表达式，感觉没什么问题，挺好的

[storm_mxj]

[Quote=引用 62 楼 bt_lose 的回复:]
我用的都是vs中提供的正则验证控件中的email正则表达式，感觉没什么问题，挺好的
[/Quote]

[cch1010]

\\w+@(\\w+\\.)+[a-z]{2,3}

[aoyihuashao1]

微软给提供的那个不一定就是完全匹配电子邮箱的。

在实际使用中

邮箱名必须以英文字母开头，可以由英文字母（a-z）、数字（0-9）和下划线组成。

[aoyihuashao1]

[e-mail]@163.cn

这种东西是绝对不可能注册成功的。

[chenjinaban]

up

[Night_Elf]

[Quote=引用 32 楼 ypyf3000 的回复:]
一些人，遇到一个问题时就想：“我知道，我将使用正则表达式。”现在他有两个问题了。

--Jamie Zawinski
[/Quote]

[feng_song]

kankan...