Why does this .net regex not work?

@"\[ [~\w]+ \]"  

Why does this regular expression not work to find [~dp0] in the string "开发者_如何学Pythonblah blah dummy text [~dp0]"

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Because of the spaces. It should be \[[~\w]+\] or use the option IgnorePatternWhiteSpace.

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Yeah... It's the spaces.

@"\[[~\w]+\]" 

If you want to ignore the spaces in the pattern, you can use RegexOptions.IgnorePatternWhitespace:

Regex.Match ("blah blah dummy text[~p0]". @"\[ [~\w]+ \]", RegexOptions.IgnorePatternWhitespace);