Some regular expressions - postcode, email, phone & mobile

RegularExpressions.cs

public static class Regexes
    {
        public const string Postcode = @"(GIR\s0AA)|(gir\s0aa)|((([A-PR-UWYZa-pr-uwyz][0-9][0-9]?)|(([A-PR-UWYZa-pr-uwyz][A-HK-Ya-hk-y][0-9][0-9]?)|(([A-PR-UWYZa-pr-uwyz][0-9][A-HJKSTUWa-hjkstuw])|([A-PR-UWYZa-pr-uwyz][A-HK-Ya-hk-y][0-9][ABEHMNPRVWXYabehmnprvwxy]))))\s{0,1}[0-9][ABD-HJLNP-UW-Zabd-hjlnp-uw-z]{2})";
        public const string Email = @"^([a-zA-Z0-9_\-\.]+)@{1}((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,6}|[0-9]{1,3})$";
        public const string Mobile = @"^(((\+?44\s?[127]\d{2,3}|\(?0\d{4}\)?)\s?\d{3}\s?\d{3})|((\+?44\s?\d{3}|\(?0\d{3}\)?)\s?\d{3}\s?\d{4})|((\+?44\s?\d{2}|\(?0\d{2}\)?)\s?\d{4}\s?\d{4}))$";

    }