Form to work with

• The string starts
• match any of the characters -,0-9, a-z, A-Z, ., + or _ (one or more times)
• match the @ stymbol (once)
• match any of the characters -,0-9, a-z, A-Z, ., + or _ (one or more times)
• match the . symbol
• match ny of a-z, A-Z or . (two to five times)
• the string ends