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Negate characters for Regex email
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Negate characters for Regex email
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I am trying to write a basic regex to validate an email address. For this specific case I am trying to make sure the string inputted only includes letters, numbers, "." and "@". Or in other words I am making sure it doesnt include characters like £&¬! etc.
I tried getting the NOT version of this [[:alnum:].@]+ so that it would highlight a character not in that set but I couldnt get it to work. I also tried characters not in [\W.@]+ (the . is meant to be escaped but stackoverflow is removing the \ from this post) but the \W is still picking up the . and @ symbols.
You can ...
- ... match for positives (your regex plus anchors to make sure it matches the complete test string)
(^[[:alnum:].@]+$) - ... match for negatives which means that at some point an illegal character occurs
([^[:alnum:].@])
... and check whether there has been a match. n the first case that means 'ok', in the second 'fail'.
Theer are regex dialects that do not support posix character classes, in this case replace [:alnum:] with 0-9a-zA-Z.
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