C# regex pattern-matching string-matching

正则表达式无法匹配字符串

发布于 2024-10-20 08:26:10 字数 347 浏览 1 评论 0原文

我在下面有一段代码，我试图用它来匹配字符串的开头和结尾，其中中间可以改变。我首先尝试让这个例子工作，有人可以告诉我这个代码的错误以及为什么它根本不匹配。

      string pattern = @"/\/>[^<]*abc/";
      string text = @"<foo/> hello first abc hello second abc <bar/> hello third abc";
      Regex r = new Regex(pattern, RegexOptions.IgnoreCase);
      Match m = r.Match(text);

原文

I have a piece of code below which I am trying to use to match the start and the end of a string where the middle can change. I am first trying to get this example working could someone please tell me the error with this code and why it is not matching at all.

      string pattern = @"/\/>[^<]*abc/";
      string text = @"<foo/> hello first abc hello second abc <bar/> hello third abc";
      Regex r = new Regex(pattern, RegexOptions.IgnoreCase);
      Match m = r.Match(text);

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人疚 2024-10-27 08:26:10

您不需要分隔符，在 c# 中您只需指定正则表达式：

  string pattern = @"\/>[^<]*abc";


  string text = @"<foo/> hello first abc hello second abc <bar/> hello third abc";


  Regex r = new Regex(pattern, RegexOptions.IgnoreCase);


  Match m = r.Match(text);

You don't need the delimiters, in c# you just specify the Regex:

  string pattern = @"\/>[^<]*abc";


  string text = @"<foo/> hello first abc hello second abc <bar/> hello third abc";


  Regex r = new Regex(pattern, RegexOptions.IgnoreCase);


  Match m = r.Match(text);

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海夕 2024-10-27 08:26:10

如果只有相关字符串的中间部分会发生变化，那么为什么不使用 String.StartsWith 和 String.EndsWith 呢？例如：

var myStringPrefix = "prefix";
var myStringSuffix = "suffix";
var myStringTheChangeling = "prefix random suffix";

if (myStringTheChangeling.StartsWith(myStringPrexix) &&
    myStringTheChangeling.EndsWith(myStringSuffix))
{
    //good to go...
}

If only the middle portion of the string in question is subject to change, then why not use String.StartsWith and String.EndsWith? For example:

var myStringPrefix = "prefix";
var myStringSuffix = "suffix";
var myStringTheChangeling = "prefix random suffix";

if (myStringTheChangeling.StartsWith(myStringPrexix) &&
    myStringTheChangeling.EndsWith(myStringSuffix))
{
    //good to go...
}

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