c# - Regex expression error -


currently dont want below string passed regex

refer mtf#y2015-19555

regex 

(.)\\1{2,}

image1

the photo attached appeared impossible passed regex, program happened string matched regex, want know happened it

image2

i think problem is, regex-pattern differently seen regex-tester , .net framework. when using pattern in code, have keep in mind, string checked escape characters.

while regex-tester gets (.)\\1{2,}, .net framework regex gets (.)\1{2,} because "\\" becomes \. fix changing pattern string pattern = "(.)\\\\1{2,}"; or disable escape characters using string pattern = @"(.)\\1{2,}";.

you can see difference considering pattern \w.

regex.match("\w", myteststring);

this cause compiler error because "\w" contains unknown escape sequence (the string evaluated @ development time). fix error, i'm adding @ in front of string , compiler satisfied.

regex.match(@"\w", myteststring);

in case, don't error because "\\" still valid string. experienced,

regex.match("\\", myteststring); regex.match(@"\\",myteststring);

may lead different results.


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