无效的正则表达式 [英] An invalid regex pattern

问题描述

我在来检查，如果值是一个有效的正则表达式C＃中的一段代码。
码是直截了当：

I have a piece of code in c# that checks if a value is a valid regex pattern. Code is straight forward:

     try
   {
      System.Text.RegularExpressions.Regex.IsMatch("", pattern);
   }
   catch (Exception)
   {
       return "pattern matches must be a valid regex value";
   }

我想要测试是否工作正常，但我无法找到无效的正则表达式..嘿嘿

I'm trying to test if it works correctly but I can't find an invalid regex pattern.. hehe

有什么建议？

推荐答案

这是无效...

[

您还可以测试在实时的正则表达式的有效性< A HREF =http://regexhero.net/tester/> http://regexhero.net/tester/

You can also test the validity of regular expressions in real-time at http://regexhero.net/tester/

顺便说一句，你实际上没有测试正则表达式对一个字符串，看它是否有效。你可以简单地实例化一个新的正则表达式对象，并捕获异常。

By the way, you don't actually have to test the regular expression against a string to see if it's valid. You can simply instantiate a new Regex object and catch the exception.

这是正则表达式的英雄呢返回详细的错误信息......

This is what Regex Hero does to return a detailed error message...

public string GetRegexError(string _regexPattern, RegexOptions _regexOptions)
{
    try
    {
        Regex _regex = new Regex(_regexPattern, _regexOptions);
    }
    catch (Exception ex)
    {
        return ex.Message;
    }

    return "";
}

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