正则表达式，高分征答，内详！散分！

[iStringTheory]

问题祥述如下：
－－－－－－－
1、使用正则表达式怎样将如下代码分成几个字符串，字符串的数目等于n+1,n是代码中<div runat=server id="id1....id(n)"></div>(n个div)的数量；
2、同时要求取得各个div的id；

－－－－－－－－ 示例代码 －－－－－－－－－－－－－－－－－－－－－－
<table width="80%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td bgcolor="#FF6600"> </td>
<td bgcolor="#66CC66"> <div id="d002" runat="server"></div></td>
</tr>
<tr>
<td bgcolor="#0066FF"> <div id="d001" runat="server"></div></td>
<td bgcolor="#FFFF66"> </td>
</tr>
</table>
－－－－－－－－ 代码结束 －－－－－－－－－－－－－－－－－－－－－－
举例如下：
－－－－
上述代码可以拆分成str1、str2、str3三个字符串：

str1="<table width="80%" border="0" cellspacing="0" cellpadding="0"> <tr><td bgcolor="#FF6600"> </td><td bgcolor="#66CC66"> "

str2="</td></tr><tr><td bgcolor="#0066FF"> "

str3="</td><td bgcolor="#FFFF66"> </td></tr></table>"

说明：
－－
这里div数量为2，拆分成3个字符串，将<div runat=server id="id1....id(n)"></div>剔除了出来

要求：
－－
要求一个通用的代码，不仅限于代码中有两个div的情况，可以对有任意多个div有效。
好啦，不知我说清楚没有，大家看看例子应该可以明白的。
谢谢各位！恭候阁下的答案！再次感谢！（：

[sunruijia]

学过编译原理吗？用自动机DFA

[大健]

关注

[saucer]

the reason you need +=3 is because there are two pairs of (..) inside the pattern, the Split method output them after every substring


testreg.cs:

using System;
using System.Collections;
using System.Text.RegularExpressions;
class TestPattern
{
public static void Main()
{

String s = "<table width=\"80%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n"
+ "<tr>\n"
+"<td bgcolor=\"#FF6600\"> ;<div id=\"d003\" runat=\"server\"></div></td>\n"
+ "<td bgcolor=\"#66CC66\"> <div id=\"d002\" runat=\"server\"></div></td>\n"
+"</tr>\n"
+"<tr>\n"
+" <td bgcolor=\"#0066FF\"> <div id=\"d001\" runat=\"server\"></div></td>\n"
+" <td bgcolor=\"#FFFF66\"> </td>\n"
+" </tr>\n"
+"</table>\n";


//String sPattern = @"(\<div\s+id=""(d\d+)""[^\>]+\>[^\<]*\<\/div\>)";
String sPattern = "(\\<div\\s+id=\"(d\\d+)\"[^\\>]+\\>[^\\<]*\\<\\/div\\>)";
Console.WriteLine(sPattern);

Regex re= new Regex(sPattern);

String[] aSplitResult = re.Split(s);

int i;
Console.WriteLine("splitted strings:");
for (i=0; i < aSplitResult.Length; i +=3)
Console.WriteLine(i.ToString()+":"+aSplitResult[i]);

Console.WriteLine("IDs:");
for (i=2; i < aSplitResult.Length; i +=3)
Console.WriteLine(i.ToString()+":"+aSplitResult[i]);

}
}

output:
(\<div\s+id="(d\d+)"[^\>]+\>[^\<]*\<\/div\>)
splitted strings:
0:<table width="80%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td bgcolor="#FF6600"> ;
3:</td>
<td bgcolor="#66CC66"> 
6:</td>
</tr>
<tr>
<td bgcolor="#0066FF"> 
9:</td>
<td bgcolor="#FFFF66"> </td>
</tr>
</table>

IDs:
2:d003
5:d002
8:d001

[saucer]

of course, you can get rid of the first pair of (..), but make sure to change the stop to 2, i.e., i+=2

also, make sure your "s" string is not empty, try


Sub Page_Load (Sender as Object, e as EventArgs)
Dim s As String

s = "<table width=""80%"" border=""0"" cellspacing=""0"" cellpadding=""0"">"
s = s & "<tr>"
s = s & "<td bgcolor=""#FF6600""> ;<div id=""d003"" runat=""server""></div></td>"
s = s & "<td bgcolor=""#66CC66""> <div id=""d002"" runat=""server""></div></td>"
s = s & "</tr>"
s = s & "<tr> "
s = s & "<td bgcolor=""#0066FF""> <div id=""d001"" runat=""server""></div></td>"
s = s & "<td bgcolor=""#FFFF66""> </td>"
s = s & "</tr>"
s = s & "</table>"

Dim sPattern As String = "(<div\s+id=""(d\d+)""[^>]+>[^<]*</div>)"
Response.Write ("Pattern:" & sPattern & "<BR>" & s & "<BR>")
Dim re As Regex = New Regex(sPattern)
Dim aSplitResult As String() = re.Split(s)
Response.Write ("Output Array length:" & aSplitResult.Length & "<BR>")
Dim i
Response.Write("splitted strings:")
For i = 0 To aSplitResult.Length-1 step 3
Response.Write(i & ":" & aSplitResult(i) & "<BR>")
Next
Response.Write("IDs:")
For i = 2 To aSplitResult.Length-1 step 3
Response.Write(i & ":" & aSplitResult(i) & "<BR>")
Next
End Sub
</script>

<form runat="server">
</form>

[bluefish922]

UP

[iStringTheory]

to saucer(思归):
String sPattern = @"(\<div\s+id=""(d\d+)""[^\>]+\>[^\<]*\<\/div\>)";
在@这里程序报错，说无效字符，我把@移到"里面就好了，但这样就不对了吧？
反正执行结果不对，splitted strings:是0，ids返回空，为何？

[saucer]

are you kidding me?

try

String sPattern = "(\\<div\\s+id=\"(d\\d+)\"[^\\>]+\\>[^\\<]*\\<\\/div\\>)";

[iStringTheory]

kidding?
why say that?
do u think it's very interesting?!

[iStringTheory]

"(\\<div\\s+id=\"(d\\d+)\"[^\\>]+\\>[^\\<]*\\<\\/div\\>)";
^错误信息：需要表达式

[iStringTheory]

在d\\d的第二个“\”出错，错误信息：需要表达式

[saucer]

that is weird, I am running win2k server (English version) with the final release .NET Framework installed, here is my complete code:

testreg.cs:

using System;
using System.Collections;
using System.Text.RegularExpressions;
class TestPattern
{
public static void Main()
{
String s = "<table width=\"80%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr>\n"
+ "<td bgcolor=\"#FF6600\"> </td>\n"
+ "<td bgcolor=\"#66CC66\"> <div id=\"d002\" runat=\"server\"></div></td>\n"
+ "</tr><tr>\n"
+ "<td bgcolor=\"#0066FF\"> <div id=\"d001\" runat=\"server\"></div></td>\n"
+ "<td bgcolor=\"#FFFF66\"> </td>\n"
+ "</tr>\n"
+ "</table>\n";

//String sPattern = @"(\<div\s+id=""(d\d+)""[^\>]+\>[^\<]*\<\/div\>)";
String sPattern = "(\\<div\\s+id=\"(d\\d+)\"[^\\>]+\\>[^\\<]*\\<\\/div\\>)";
Console.WriteLine(sPattern);

Regex re= new Regex(sPattern);

String[] aSplitResult = re.Split(s);

int i;
Console.WriteLine("splitted strings:");
for (i=0; i < aSplitResult.Length; i +=3)
Console.WriteLine(i.ToString()+":"+aSplitResult[i]);

Console.WriteLine("IDs:");
for (i=2; i < aSplitResult.Length; i +=3)
Console.WriteLine(i.ToString()+":"+aSplitResult[i]);

}
}



here is the output:
D:\dotnet>csc testreg.cs
Microsoft (R) Visual C# .NET Compiler version 7.00.9466
for Microsoft (R) .NET Framework version 1.0.3705
Copyright (C) Microsoft Corporation 2001. All rights reserved.


D:\dotnet>testreg
(\<div\s+id="(d\d+)"[^\>]+\>[^\<]*\<\/div\>)
splitted strings:
0:<table width="80%" border="0" cellspacing="0" cellpadding="0"><tr>
<td bgcolor="#FF6600"> </td>
<td bgcolor="#66CC66"> 
3:</td>
</tr><tr>
<td bgcolor="#0066FF"> 
6:</td>
<td bgcolor="#FFFF66"> </td>
</tr>
</table>

IDs:
2:d002
5:d001

[龙腾九霄]

gz,up!

[iStringTheory]

here is my own code,what's wrong?
还是在d\\d处有错，“需要表达式”，哪里有问题？这个是我根据你的C#代码改的VB代码，有问题么？
---------------------------------------------------------------

Dim s As String = TextBox1.Text
Dim sPattern As String = "(\\<div\\s+id=\"(d\\d+)\"[^\\>]+\\>[^\\<]*\\<\\/div\\>)"
Dim re As Regex = New Regex(sPattern)
Dim aSplitResult As String() = re.Split(s)
Dim i
Response.Write("splitted strings:")
For i = 0 To aSplitResult.Length
Response.Write(i & ":" & aSplitResult(i))
i += 3
Next
Response.Write("IDs:")
For i = 2 To aSplitResult.Length
Response.Write(i & ":" & aSplitResult(i))
i += 3
Next

[iStringTheory]

D:\dot_net\e-news\index.aspx.vb(71): 需要表达式。
D:\dot_net\e-news\index.aspx.vb(72): 名称“sPattern”未声明。

[Inyoureyes]

关于正则表达式正在学习，主要来接点分：）

[superkiller]

接分

[iStringTheory]

to superkiller(毛毛雨)
帮我看看这个问题先，解决了高分相赠！

[plife]

up!

[monkey_zeng]

还没有搞定？？
我来帮你推一下！

[saucer]

try

Dim sPattern As String = "(<div\s+id=""(d\d+)""[^>]+>[^<]*</div>)"