Question

I was using a regular expression for email formats which I thought was ok but the customer is complaining that the expression is too strict. So they have come back with the following requirement:

The email must contain an “@” symbol and end with either .xx or .xxx ie.(.nl or .com). They are happy with this to pass validation. I have started the expression to see if the string contains an “@” symbol as below

^(?=.*[@])

this seems to work but how do I add the last requirement (must end with .xx or .xxx)?

Answer 1

A regex simply enforcing your two requirements is:

^.+@.+\.[a-zA-Z]{2,3}$

However, there are email validation libraries for most languages that will generally work better than a regex.