Regex for email (shouldn't match string after ; )-CodePudding

I have the following regex: /(\s?[^\s,] @[^\s,] .[^\s,] \s?;)*(\s?[^\s,] @[^\s,] .[^\s,] )/g

Could you tell me why it matches this string: "[email protected];tesr" and doesn't match this one: "[email protected]; test" ?

It shouldn't match the first string. However if there is a valid email after the ; like [email protected], it should be matched.

I will be very grateful if you could help me out.

CodePudding user response：

You can use

^[^@\s;] @[^\s;] \.[^\s;] (?:\s*;\s*[^@\s;] @[^\s;] \.[^\s;] )*;?$

See the regex demo. Details:

^ - start of string
[^@\s;] - zero or more chars other than @, whitespace and ;
@ - a @ char
[^\s;] - zero or more chars other than whitespace and ;
\. - a dot
[^\s;] - zero or more chars other than whitespace and ;
(?:\s*;\s*[^@\s;] @[^\s;] \.[^\s;] )* - zero or more repetition of a ; enclosed with zero or more whitespaces, and then the same pattern as above
;? - an optional ;
$ - end of string.