正则表达式与字符串C＃不匹配

Question

string val = "VFC - [C:\study\Run20315.5000]"
string pattern = "VFC - *C:\\study\\Rund.*"

I have written below expression but its getting false.

bool Match= Regex.IsMatch(val, pattern)

Answer 1

You forgot about the square brackets, the backslash before d is missing if you planned to match a digit and the backslashes must be doubled - or better - use a verbatim string literal. Also, note that * is a quantifier that makes the pattern preceding it match 0 or more times. If you need to match arbitrary text between two patterns, use .* or .*? and in case there can be line breaks, compile the pattern with RegexOptions.Singleline :

string pattern = @"VFC - .*C:\\study\\Run\d";
bool Match= Regex.IsMatch(val, pattern, RegexOptions.Singleline);

See the .NET regex demo and the Regulex graph :

Details

• VFC - - literal VFC - substring
• .* - any zero or more chars as many as possible
• C:\\\\study\\\\Run - a C:\\study\\Run substring
• \\d - a digit.