I’m guessing that here we wish to validate these emails, for which we can use an expression similar to:
^([a-z0-9]+((?=\..+@.+\..+)[a-z0-9.]*@[a-z0-9]*\.[a-z0-9]*))$
with an i
flag and we can allow more chars, if we like so.
RegEx Circuit
jex.im visualizes regular expressions: