Re: Regular expression to check for qwerty sequence in a password

[shadowsong]

Hi brad,

You may want to be a bit more specific in your definition of sequences. From what you've said it isn't clear what you mean. for e.g. would the sequence fdsa be acceptable? What about Asdf or asDf?

Either way; if I were to divine what you're trying to accomplish, i.e. to match a string of at least three chars that does NOT contain a multi-char sequence like "asd" or "wer" - I would tweak your if conditional and reg exp to something like this:

if (length($password) > 2 && ($password =~ m/(?:^(?!(asd)|(wer)))/))

Cheers,
Shadowsong

[bradcathey]

Shadowsong

Sorry for the confusion. I'm trying to test passwords made by just rolling all four fingers on the keyboard, hitting immediately adjacent letters, e.g., "asdf." They must be next to each other: so "asdg" wouldn't match. Case is not necessarily a consideration. Does that help?

I have been a little surprised in reading the replies to see there is no one magical regex.

[AnomalousMonk]

I have been a little surprised in reading the replies to see there is no one magical regex.

tybalt89's single regex given here not sufficiently magical?!? You're a hard monk to please!

... passwords made by ... hitting immediately adjacent letters, e.g., "asdf." They must be next to each other: so "asdg" wouldn't match.

tybalt89's regex can easily be modified so that  'asd' 'wert' 'vbnm' etc. are rejected and  'asdx' 'xasd' 'xasdx' etc. accepted. This is left as a penitential exercise for a very demanding monk.