Password Validation Regular Expression - how to include special character?

Question

@"^(?=.*[0-9]+.*)(?=.*[a-zA-Z]+.*)[0-9a-zA-Z]{6,}$"

I am using this regular expression for password validation which gives one upper case, one lowercase and a number. But what I want is a special character in it but it should optional but above mentioned must be mandatory.

Just to clarify, do you want *at least* or *exactly* one uppercase, lowercase, number, and special character. And what do you want to be optional? The existence of a special character? — Daniel, Aug 05 '16 at 17:15
can you point in the expression that checks the special character ? — Teja Nandamuri, Aug 05 '16 at 17:15
What happens with that regex when you use a special character ? Does it allow ? — Teja Nandamuri, Aug 05 '16 at 17:21
If you are just trying to see if certain characters are in a string, it might be simpler to not use regex. However if you are doing more than that regex would likely be better. — Daniel, Aug 05 '16 at 17:25
Obligatory link to this answer. http://stackoverflow.com/a/1732454/25646 — bbum, Aug 05 '16 at 22:14

score 0 · Accepted Answer · answered Aug 05 '16 at 17:41

This will allow these special characters: - (hyphen), * (asterisk) and _ (underscore).

^(?=[-_*]*)(?=.*[0-9]+.*)(?=.[a-zA-Z]+.)[-*_0-9a-zA-Z]{6,}$

If you want to add your own special characters, add them into this part of the regex [-*_0-9a-zA-Z] (inside the square bracket)

Password Validation Regular Expression - how to include special character?

1 Answers1