正则表达式在线匹配，但不在C＃代码中(Regex matches online but not in C# code)

正则表达式在线匹配，但不在C＃代码中(Regex matches online but not in C# code)

这个正则表达式适用于在线正则表达式测试人员，但是当我尝试这段代码时，正则表达式不匹配。

Regex regex = new Regex(@"^\.lnr-(.*)\:before \{$", RegexOptions.Compiled | RegexOptions.Multiline); string css = System.IO.File.ReadAllText(Server.MapPath("/linearicons-free.css")); foreach (Match match in regex.Matches(css)) { //doing sth }

我错过了什么？

This regex works at online regex testers but when I try this piece of code regex does not match.

Regex regex = new Regex(@"^\.lnr-(.*)\:before \{$", RegexOptions.Compiled | RegexOptions.Multiline); string css = System.IO.File.ReadAllText(Server.MapPath("/linearicons-free.css")); foreach (Match match in regex.Matches(css)) { //doing sth }

What am I missing ?

最满意答案

当C＃解析字符串时，最后会有一个\n 。 所以你的模式^\.lnr-(.*):before \{$失败^\.lnr-(.*):before \{$因为你期望的最后一个charcater是{

将模式更改为^\.lnr-(.*):before \{\s$ ，它应该可以工作。

你可以在这里测试.NET正则表达式而不是regex101.com

There is a \n at the end when C# is parsing the string. So your pattern^\.lnr-(.*):before \{$ fails because the last charcater you are expecting is {

Change the pattern to ^\.lnr-(.*):before \{\s$ and it should work.

you can test the .NET regexes here instead of regex101.com