Java Regex for password validation

Question

I have created regex for password validation in a Java app. The regex I created is below for below requirement.

^[\\p{Alnum}#.!@$*&_]{5,12}$

I am missing 1 and 2 like if I give "gjsajhgjhagfj" or "29837846876", it should fail. But it's not happening.

Could anyone help please?

Is there a reason you restrict it to 12 chars maximum? This doesn't seem logical to me. — Sebastian Proske
– Sebastian Proske, Commented Mar 8, 2016 at 23:29
No worries, the good thing is that there are always people willing to help, do NOT be discouraged... Everyone deserved to be helped as long as he shows that he already did some effort and he failed to achieve what he wants, which you clearly did <3 — Enissay
– Enissay, Commented Mar 8, 2016 at 23:56

Enissay · Accepted Answer · 2016-03-08 23:58:01Z

3

You can use lookaheads to force conditions 1 & 2:

^(?i)(?=.*[a-z])(?=.*[0-9])[a-z0-9#.!@$*&_]{5,12}$

(?i) is for insensitive match, the same as Pattern.CASE_INSENSITIVE flag for your compile function:

Pattern.compile(regex, Pattern.CASE_INSENSITIVE)

You can read more about Lookaheads HERE

answered Mar 8, 2016 at 23:15

Enissay

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