C# Regex Issue “unrecognized escape sequence”

Question

I have an issue with the regular expressions I\'m using but don\'t know how to continue with them. I get the error \"unrecognized escape sequence\".

I am trying to l

Answer 1

The problem is not the regex, but the string. Before compiling it to a regex with the call to IsMatch(), the text you enter is still a normal string and it must obey the language rules.

\d in your language is not a recognized escape sequence, hence the error. You can either double backslashes (\ is the escape sequence to get a ) or, as Blindy pointed out, you can prefix your constant strings with a @, telling the compiler that it should not try to interpret anything looking like an escape sequence to it.