Hello,

I am trying to replace the @ by (at) in all emails in a text. Nothing is replaced.

I tried it in two ways but both don't produce any change:

      string a = "my email is john@gmail.com and @01 or ab@cd are not emails. The following <a href="mary@gmail.com">mary@gmail.com</a> is an anchor";

      string b = Regex.Replace(a, @"(?<name>\w+([-+.]\w+)+)@(?<domain>\w+([-.]\w+)*\.\w+([-.]\w+)*)", "${name}(at)${domain}");

      string c = Regex.Replace(a, @"(?<=\w+([-+.]\w+)+)(at)(?>\w+([-.]\w+)*\.\w+([-.]\w+)*)", "(at)");

Could someone, please, help me out?

Thanks,
Miguel

If you change the 'string b' regex to be:

(?<name>\w+([-+.]\w+)*)@(?<domain>\w+([-.]\w+)*\.\w+([-.]\w+)*)

(i.e. change the '+' to '*' after the '([-+.]\w+)') then it finds 3 "emails" - one for john@gmail.com and 2 for mary@gmail.com. The replaced text becomes:

my email is john(at)gmail.com and @01 or ab@cd are not emails. The following <a href="mary(at)gmail.com">mary(at)gmail.com</a> is an anchor

'string c' won't work because there are no "(at)" strings in the sample text.

Also, I'm surprised that the computer didn't throw a syntax error in your definition of 'string a' in that there are unescaped double-quotes - perhaps this is a transcription error into the forum.

Susan