Regular Expressions in CoffeeScript

emailPattern.coffee

emailPattern = /// ^ #begin of line
   ([\w.-]+)         #one or more letters, numbers, _ . or -
   @                 #followed by an @ sign
   ([\w.-]+)         #then one or more letters, numbers, _ . or -
   \.                #followed by a period
   ([a-zA-Z.]{2,6})  #followed by 2 to 6 letters or periods
   $ ///i            #end of line and ignore case

if "john.smith@gmail.com".match emailPattern
   console.log "E-mail is valid"
else
   console.log "E-mail is invalid"

emailPattern.js

var emailPattern = /^([\w.-]+)@([\w.-]+)\.([a-zA-Z.]{2,6})$/i;

if ( "john.smith@gmail.com".match( emailPattern ) ) {
   console.log( "E-mail is valid" );
} else {
   console.log( "E-mail is invalid" );
}