Regex for email Validation in javascript

Question

I am trying to validate an email using the regular expressions. I alomost done but I am failing in one condtion alone which is "a '-' (hyphen) should not be followed by '@'". I tried in different ways but nothis worked. Below is the regex I am currently using.

regex = /^(?!.*\.{2})[a-zA-Z0-9][a-zA-Z0-9#$%&\*\+-/=\?\_`|~]*@[a-zA-Z0-9][a-zA-Z0-9-_.]*\.[a-zA-Z]{2,4}$/;

PS : I know the the above regex stops for using two consecutive periods but its my project requirement :(

Please help me in validating for '-' followed by '@' and vice-versa.

Thanks, Yeshwanth

Answer 1

Easiest is to add (?!.*-@) after your first lookahead.

Answer 2

Why not just add

[a-zA-Z0-9#$%&\*\+-/=\?\_`|~]*[a-zA-Z0-9#$%&\*\+/=\?\_`|~]@

instead of

[a-zA-Z0-9#$%&\*\+-/=\?\_`|~]*@

?

And is it OK to have a + or, say, a # right before the dog?