The following are code snippets for common regular expressions in C#.

If you have a regular expression that you think is common or a correction/improvement to one of mine, please submit it.

IP address pattern or expression

The expression:

^[\w!#$%&'*+\-/=?\^_`{|}~]+(\.[\w!#$%&'*+\-/=?\^_`{|}~]+)*@((([\-\w]+\.)+[a-zA-Z]{2,4}$)|(([0-9]{1,3}\.){3}[0-9]{1,3}))

In CSharp code:

String theIpAddressPattern = @"^[0-9]{1,3}\.){3}[0-9]{1,3}$";

Domain name pattern or expression

The expression:

^[\-\w]+\.)+[a-zA-Z]{2,4}$

In CSharp code:

String theDoainNamePattern = @"^[\-\w]+\.)+[a-zA-Z]{2,4}$";

Email address pattern or expression

The expression:

^[\w!#$%&'*+\-/=?\^_`{|}~]+(\.[\w!#$%&'*+\-/=?\^_`{|}~]+)*@((([\-\w]+\.)+[a-zA-Z]{2,4}$)|(([0-9]{1,3}\.){3}[0-9]{1,3}))

In CSharp code:

String theEmailPattern = @"^[\w!#$%&'*+\-/=?\^_`{|}~]+(\.[\w!#$%&'*+\-/=?\^_`{|}~]+)*"
                                   + "@"
                                   + @"((([\-\w]+\.)+[a-zA-Z]{2,4})|(([0-9]{1,3}\.){3}[0-9]{1,3}))$";

a

The URL Pattern

The expression:

((^http(s)*://(([\-\w]+\.)+[a-zA-Z]{2,4}.*)))$|(^ftp://([\w](:[\w]))*(([\-\w]+\.)+[a-zA-Z]{2,4}[/\w]*))$

In CSharp code:

            String theURLPattern = @"((^http(s)*://(([\-\w]+\.)+[a-zA-Z]{2,4}.*)))$"
                                 + @"|(^ftp://([\w](:[\w]))*(([\-\w]+\.)+[a-zA-Z]{2,4}[/\w]*))$";

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