regex with 3 upper case and lower case

Question

I need regex that checks if string has at least 3 uppercase, 3 lowercase letters and at least one specialcharacter.

Currently I have this:

^(?=.*[a-z]{3,})(?=.*[A-Z]{3,})(?=.*\d)(?=.*(_|[^\w])).+$

But it only works if the characters are next to eachother.

Example of what it should match:

S4L4S6na#a

score 3 · Accepted Answer · edited May 23 '17 at 12:07

3

This will work

(?=(.*[A-Z]){3})(?=(.*[a-z]){3})(?=.*(_|[^\w]))

If you want to also include digit

(?=.*\d)(?=(.*[A-Z]){3})(?=(.*[a-z]){3})(?=.*(_|[^\w]))

Further optimization as per comments

You can use non-greedy approach, which optimizes the above regex and use [\W_] instead of (_|[^\w])

(?=(.*?[A-Z]){3})(?=(.*?[a-z]){3})(?=.*?[\W_])

edited May 23 '17 at 12:07

Community

answered Apr 11 '16 at 12:16

rock321987

2

I **think** you'll get better performance if you make `.*` *non-greedy*. I.e. `.*?`. (Probably not an issue, but... ;) – SamWhan Apr 11 '16 at 12:21
1

Yeah, adding the `?` makes it drop from 776 steps to 353 steps. And then appending `.+` makes it drop to 135 steps. – 4castle Apr 11 '16 at 12:33
3

And for those who love optimization: `(_|[^\w])` > `[\W_]` – Wiktor Stribiżew Apr 11 '16 at 12:46
@WiktorStribiżew thanks for telling..didn't knew about it..updated with an explanation of reason – rock321987 Apr 11 '16 at 14:26

1 Answers1