正则表达式匹配整个单词与特殊字符不起作用？

Question

我正在经历这个问题 C#,Regex.Match整个单词

它说匹配整个单词使用"\ bpattern\b" 这适用于匹配整个单词而没有任何特殊字符,因为它仅用于单词字符!

我需要一个表达式来匹配带有特殊字符的单词.我的代码如下

class Program
{
    static void Main(string[] args)
    {
        string str = Regex.Escape("Hi temp% dkfsfdf hi");
        string pattern = Regex.Escape("temp%");
        var matches = Regex.Matches(str, "\\b" + pattern + "\\b" , RegexOptions.IgnoreCase);
        int count = matches.Count;
    }
}

但由于%,它失败了.我们有解决方法吗？ 可以有其他特殊字符,如'space','(',')'等

Answer 1

如果您有非单词字符,则无法使用\b.您可以使用以下内容

@"(?<=^|\s)" + pattern + @"(?=\s|$)"

编辑:正如蒂姆在评论中提到的那样,你的正则表达式正在失败,因为它们\b之间的边界%与它旁边的空格不匹配,因为它们都是非单词字符.\b仅匹配单词字符和非单词字符之间的边界.

查看更多关于单词边界位置.

说明

@"
(?<=        # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind)
               # Match either the regular expression below (attempting the next alternative only if this one fails)
      ^           # Assert position at the beginning of the string
   |           # Or match regular expression number 2 below (the entire group fails if this one fails to match)
      \s          # Match a single character that is a “whitespace character” (spaces, tabs, and line breaks)
)
temp%       # Match the characters “temp%” literally
(?=         # Assert that the regex below can be matched, starting at this position (positive lookahead)
               # Match either the regular expression below (attempting the next alternative only if this one fails)
      \s          # Match a single character that is a “whitespace character” (spaces, tabs, and line breaks)
   |           # Or match regular expression number 2 below (the entire group fails if this one fails to match)
      $           # Assert position at the end of the string (or before the line break at the end of the string, if any)
)
"

Answer 2

如果模式可以包含 Regex 特有的字符，请首先通过Regex.Escape运行它。

您已这样做，但不要转义您搜索的字符串 - 您不需要这样做。