Answer by Dreamray for How can I validate an email address using a regular expression?

Maybe the best:

/^[a-zA-Z0-9]+([-._][a-zA-Z0-9]+)*@[a-zA-Z0-9]+([-.][a-zA-Z0-9]+)*\.[a-zA-Z]{2,7}$/

Start with a letter or number. It may include "-_ .", end with "." and less than seven characters (such as .company).