快速问答——base64码的正则表达式，立刻给分！

[乘思者]

如何写他的分组表达式？

其实就是取出aspx页中的<input type=""hidden""' name=""__VIEWSTATE"" 中的value值而已，只要无误的取出来，立马给分！

[乘思者]

这么个简单的问题都没人会？
还是大家都在中午睡觉？
不会吧！

[supergreenbean]

XmlTextReader.ReadBase64....

[代码蜗牛sky]

string str = "<input type=\"\"hidden\"\"' name=\"\"__VIEWSTATE\"\">";

MatchCollection mc = Regex.Matches(str,"\\w*=\"\\w*\"");

foreach(Match m in mc)
{
Console.WriteLine(m.Value);
}

Console.ReadLine();

[代码蜗牛sky]

上面那个搞错了，应该是这样

string str = "<input type=\"\"hidden\"\"' name=\"\"__VIEWSTATE\"\">";

MatchCollection mc = Regex.Matches(str,"\\w*=\"\"\\w*\"\"");

foreach(Match m in mc)
{
int index = m.Value.IndexOf("\"\"")+2;

Console.WriteLine(m.Value.Substring(index,m.Value.Length - index -2));
}

Console.ReadLine();

[乘思者]

to 楼上，误会！误会！
是从字符串

<input type="hidden" name="__VIEWSTATE" value="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" ID="Hidden1"/>

中取出value值，而且，你的匹配字符串是不对的，base64码中还有不是单词组成字符的字符，这个也要考虑的。

[robert2004]

帮顶接分。。。



=====================================
《《《《《苦海无边 回头无岸》》》》》
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[代码蜗牛sky]

我的答复是根据你一开始的描述来写的

Base64是由英文字母，数字和+,/组成的，改改就行了，等等...

[代码蜗牛sky]

string str = "<input type=\"hidden\" name=\"__VIEWSTATE\" value=\"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\" ID=\"Hidden1\"/>";


MatchCollection mc = Regex.Matches(str,"value=\"[a-z,A-Z,0-9,/,+,=]*\"");

foreach(Match m in mc)
{
int index = m.Value.IndexOf("\"")+1;

Console.WriteLine(m.Value.Substring(index,m.Value.Length - index -1));
}

[乘思者]

是啊，你没有错，是我没说明白。

大概差不多了，就剩下最后一点了：
=是在最后才能出现的，而你的表达式中，中间出现也可以。
当然，这个不是主要问题，还有个问题是，我要取出来，不是找到（用

public static string GetFormStateValue(string htmlPageString)
{
Regex r = new Regex(@"<input type=""hidden"" name=""__VIEWSTATE"" value=""(?<v>[^""]+)"" />",RegexOptions.Compiled);
//[\w\+/]+[=]*
Match m = r.Match(htmlPageString);
bool v = m.Success;
// if(m.Success)
// {
return m.Result("${v}");
// }
}

取出来）。麻烦下最后一步！（写下Regex的实例化参数吧！^_^




）

[代码蜗牛sky]

改成下面这样，=就只能在最后面出现零到任意多个了

MatchCollection mc = Regex.Matches(str,"value=\"[a-z,A-Z,0-9,/,+]*[=]{0,}\"");

[代码蜗牛sky]

有事做，回来帮你改后面的部分

[lengyixin]

UP^^^^^^

[代码蜗牛sky]

Regex re = new Regex("value=\"(?<base64>[a-z,A-Z,0-9,/,+]*[=]{0,})\"");

Match m = re.Match(str);

Console.WriteLine(m.Result("${base64}"));

[乘思者]

谢谢，散分！