vs.net 2005正则表达式无限循环... [英] vs.net 2005 regular expression infinite loop...
问题描述
我有一个aspx文件（下面显示的代码段）：
=======
< td class =" light- M1" ID = QUOT; rwCompleteButton" runat =" server">< br />
< asp：ImageButton CssClass =" clear-m1" runat =" server"
CommandName =" Complete" ID = QUOT; btnComplete" />
< asp：ImageButton CssClass =" clear-m1" runat =" server"
CommandName ="删除" ID = QUOT; btnDelete" />
< / td>
=======
和以下.cs文件到执行（下面的代码段）
========
strReg = @"（< \w + :(。| | [\\ \\ r \\ n]）*？id ="" btnComplete""）（[^>] +>）" ;;
reg = new Regex（strReg）;
if（！reg.IsMatch（uiStr））
{
blah ... blah ...
}
========
上面的if语句将进入无限循环。但是，当我在Expresso（在vs.net 2003中编写的第三方工具）上尝试
表达式时，它匹配
就好了。
有什么想法吗？
-
-jojobar
I have a aspx file (snippet shown below):
=======
<td class="light-m1" id="rwCompleteButton" runat="server"><br/>
<asp:ImageButton CssClass="clear-m1" runat="server"
CommandName="Complete" ID="btnComplete" />
<asp:ImageButton CssClass="clear-m1" runat="server"
CommandName="Delete" ID="btnDelete" />
</td>
=======
and the following .cs file to execute (snippet below)
========
strReg = @"(<\w+:(.|[\r\n])*?id=""btnComplete"")([^>]+>)";
reg = new Regex(strReg);
if (!reg.IsMatch(uiStr))
{
blah...blah...
}
========
The if statement above is going to infinite loop. However, when I try the
expression on Expresso (a third party tool written in vs.net 2003) it matches
just fine.
Any ideas?
--
-jojobar
推荐答案
抱歉忘了提到我在执行此代码之前首先在uiStr
中读取aspx文件。
谢谢
-
-jojobar
" jojobar"写道：
sorry forgot to mention that I am first reading the aspx file in the uiStr
before executing this code.
Thanks
--
-jojobar
"jojobar" wrote:
我有一个aspx文件（下面显示的代码段）：
=======
< td class =" ;光-M1" ID = QUOT; rwCompleteButton" runat =" server">< br />
< asp：ImageButton CssClass =" clear-m1" runat =" server"
CommandName =" Complete" ID = QUOT; btnComplete" />
< asp：ImageButton CssClass =" clear-m1" runat =" server"
CommandName ="删除" ID = QUOT; btnDelete" />
< / td>
=======
以及要执行的以下.cs文件（下面的代码段）
> ========
strReg = @"（< \w + :(。| [\\\\ n]）*？id ="" btnComplete""） （[^>] +>）" ;;
reg = new Regex（strReg）;
if（！reg.IsMatch（uiStr））
{
等等。 ..blah ...
}
========
上面的if语句将进入无限循环。但是，当我在Expresso（在vs.net 2003中编写的第三方工具）上尝试
表达时，它匹配
就好了。
任何想法？
- -
-jojobar
I have a aspx file (snippet shown below):
=======
<td class="light-m1" id="rwCompleteButton" runat="server"><br/>
<asp:ImageButton CssClass="clear-m1" runat="server"
CommandName="Complete" ID="btnComplete" />
<asp:ImageButton CssClass="clear-m1" runat="server"
CommandName="Delete" ID="btnDelete" />
</td>
=======
and the following .cs file to execute (snippet below)
========
strReg = @"(<\w+:(.|[\r\n])*?id=""btnComplete"")([^>]+>)";
reg = new Regex(strReg);
if (!reg.IsMatch(uiStr))
{
blah...blah...
}
========
The if statement above is going to infinite loop. However, when I try the
expression on Expresso (a third party tool written in vs.net 2003) it matches
just fine.
Any ideas?
--
-jojobar
您好Jojobar，
欢迎使用ASP.NET新闻组。 />
至于你提到的正则表达式问题，我认为你可以先通过.net调节器工具测试
正则表达式。这是一个纯粹的.net开发的正则表达式
测试工具：
http://sourceforge.net/project/showf...roup_id=105210
，根据您提供的代码，您使用了以下正则表达式：
strReg = @"（< \w + :(。| [\\\\ n]）*？id ="" btnComplete""）（[ ^>] +>）" ;;
根据我的测试，原始的正则表达式应该是
（< \w + :(。 ？| [\r\\\
]）* ID = QUOT; BT nComplete）（[^>] +>）并使用"逃避，
是吗？
如果是这样，这在.net中不起作用，因为"是不是正确的逃避
"在C＃中，你可以考虑使用
strReg ="（< \\\\ + :(。| [\\\\\\ n]）*？ ID = \" btnComplete\"）（[^>] +>）" ，无论如何
手动用C＃格式的转义字符替换每个特定字符。
希望这会有所帮助。
问候，
Steven Cheng
微软在线支持
安全！ www.microsoft.com/security
（此帖子按原样提供，不作任何保证，并且不授予
权利。）
Hi Jojobar,
Welcome to ASP.NET newsgroup.
As for the regex problem you mentioned, I think you can first test the
regex through the .net regulator tool which is a pure .net developed regex
testing tool:
http://sourceforge.net/project/showf...roup_id=105210
also, from the code you provided, you used the following regex expression:
strReg = @"(<\w+:(.|[\r\n])*?id=""btnComplete"")([^>]+>)";
based on my test, the original regex should be
(<\w+:(.|[\r\n])*?id="btnComplete")([^>]+>) and you use "" to escape " ,
yes?
If so, this will not work in .net because "" is not the correct escape for
" in C#, you may consider use
strReg = "(<\\w+:(.|[\\r\\n])*?id=\"btnComplete\")([^>]+>)" , anyway
manually replace each particular char with the escaped one in C# format.
Hope this helps.
Regards,
Steven Cheng
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
Hello Steven，
谢谢你的时间。我用一个名为expresso的工具测试了它，这是一个更好的正则表达式评估工具。
。
另外两个&bt。你提到的是因为我使用字符串文字
来逃避引号。例如
str = @"这是" a'''''测试
和
str ="这是\a \"测试
是等价的。
BTW我将表情改为第二种形式，它仍然在里面
无限循环！
谢谢
-
-jojobar
" Steven Cheng [MSFT]"写道：
Hello Steven,
Thank you for your time. I tested it with a tool called expresso which is
(in my opinion) a better regex evaluator tool.
Also the two "" you mentioned is there because I used a string literal to
escape the quotes. For exanmple
str = @"This is ""a''''" test"
and
str = "This is \"a\" test"
are equivalent.
BTW I changed my expression to the second form and it still goes inside
infinite loop!
Thanks
--
-jojobar
"Steven Cheng[MSFT]" wrote:
嗨Jojobar，
欢迎来到ASP.NET新闻组。
关于你提到的正则表达式问题，我认为你可以先通过.net调节工具测试
正则表达式。这是一个纯粹的.net开发的正则表达式测试工具：
http://sourceforge.net/project/showf...roup_id=105210
另外，根据您提供的代码，您使用了以下正则表达式：
strReg = @"（< \w + :(。| [\\\\ n]）* ？id ="" btnComplete""）（[^>] +>）" ;;
根据我的测试，原始的正则表达式应该是
（< \w + :(。| [\\\\ n]）*？id =" btnComplete"）（[^>] +>）并使用"逃避，
是吗？
如果是这样，这将无法在.net中使用，因为"对于
而言，这不是正确的逃避在C＃中，您可以考虑使用
strReg ="（< \\\\ + :(。| [\\\\\\ n]）*？id = \ " btnComplete\"）（[^>] +>）" ，无论如何
用C＃格式的转义手动替换每个特定的字符。
希望这会有所帮助。
问候，
史蒂文Cheng
Microsoft在线支持
获得安全！ www.microsoft.com/security
（此帖已提供按原样，没有保证，也没有赋予
权利。）
Hi Jojobar,
Welcome to ASP.NET newsgroup.
As for the regex problem you mentioned, I think you can first test the
regex through the .net regulator tool which is a pure .net developed regex
testing tool:
http://sourceforge.net/project/showf...roup_id=105210
also, from the code you provided, you used the following regex expression:
strReg = @"(<\w+:(.|[\r\n])*?id=""btnComplete"")([^>]+>)";
based on my test, the original regex should be
(<\w+:(.|[\r\n])*?id="btnComplete")([^>]+>) and you use "" to escape " ,
yes?
If so, this will not work in .net because "" is not the correct escape for
" in C#, you may consider use
strReg = "(<\\w+:(.|[\\r\\n])*?id=\"btnComplete\")([^>]+>)" , anyway
manually replace each particular char with the escaped one in C# format.
Hope this helps.
Regards,
Steven Cheng
Microsoft Online Support
Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
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