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

Use @ to make the strings no longer use the escape character \:

string regexPattern1 = @"^(\d{3}\.){2}\d{4}$";
string regexPattern2 = @"^((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}$";

As a side note, I think you want the two ifs at the end to be a single if with an or (||) between the two conditions.