In my authentification web site, I'm using regex to control a blacklist password. (example of blacklisted password : 12345678, 123456789, baseball, football)
I would like to add new regex rule (using boundary), which will exclude words (black listed password). I have read some similar questions on StackOverflow and tried to declare it with something like this:
^(?!\b12345678\b|\b123456789\b|\bbaseball\b|\bfootball\b|\bsuperman\b).*$
this regex doesn't match the words above, it's correct. For exemple "Baseball" with a letter, number or special character (before or after the "baseball") must match.
But "baseball!" doesn't match contrary to "!baseball". Can you give me some advices how to do it?
But "baseball!" doesn't match contrary to "!baseball"…
baseball! doesn't match because your pattern doesn't allow baseball at the beginning (^ followed by a negative lookahead for baseball).
!baseball in contrast matches because ! is placed at the beginning, and the negative lookahead is done only there, not aft.
One could think of putting the .* at different places, but that will lead to nothing.
Just include the anchors ^ $ in the lookahead:
(?!^(12345678|123456789|baseball|football|superman)$)^.*$
(in fact, we could even drop the initial ^).