Examples of Swift regular expressions (selected from "Swifter 100 swift Development Essentials Tip")

    struct regexhelper {        let  regex: nsregularexpression?        init (_ pattern:  string)  {            var error:  NSError?            regex =  Nsregularexpression (pattern: pattern,                 options: . caseinsensitive,                 error: &error)         }         func match (input: string)  -> Bool {             if let matches = regex?. MatchesinstrinG (input,                 options: nil,                 range: nsmakerange (0, count (input))  {                     return matches.count >  0            } else {                 return false             }         }    }            //authentication method              let mailpattern =   "^ ([a-z0-9_\\.-]+) @ ([\\da-z\\.-]+)\\. ([a-z\\.] {2,6}) $ "        let matcher = regexhelper (MailPattern)                                   let maybemailaddress =   "[email protected]"                  if matcher.match (maybemailaddress)         {             PRINTLN ("Valid e-mail address")          }        else         {        PRINTLN ("Invalid email address")                  }

Examples of Swift regular expressions (selected from "Swifter 100 swift Development Essentials Tip")