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RegEx Password Validation

Posted on 2014-04-11
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Last Modified: 2014-04-14
I am looking for help building a regular expression for testing password complexity. The password requirements are:
 - one upper case
 - one lower case
 - one special character or number
 - at least 8 characters
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Question by:evilmonkey2148
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10 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39994939
What text editor, programming language, or other miscellaneous utility are you using for password validation?
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Accepted Solution

by:
ozo earned 500 total points
ID: 39994941
(?=.*[A-Z])(?=.*[a-z])(?=.*\W).{8}
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39994966
Since \W means spaces too, I would use
(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9~!@#$%^&*]).{8,}

HTH,
Dan
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Expert Comment

by:Terry Woods
ID: 39997842
Without start and end of string placeholders, this validation may be vulnerable to failure. Details given here: http://www.experts-exchange.com/Programming/Languages/Regular_Expressions/Q_28411422.html#a39997831
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39997881
Terry,

I initially thought that too, but on further examination it shouldn't. Because the requirement only says, "at least 8 characters," the pattern holds. If it instead said, "between 8 and 15 characters," for example, then further restriction would be needed.
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LVL 35

Expert Comment

by:Terry Woods
ID: 39997936
Ah, yes, good point! :-)
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Author Comment

by:evilmonkey2148
ID: 39998986
problem with this expression:
(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9~!@#$%^&*]).{8,}

is that i need to accept any special character on the keyboard.
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39999027
Considering you use a non-Unicode variant, \W means "anything that is not a letter A to Z, a to z, a number 0 to 9 or an underscore _".

This makes _ to not be allowed as a special character, while it will accept space, tab, carriage returns, bell, etc.  

It's better, IMO to specify exactly what is a "special character". \W is faster to write/read, but that's where its merits stop.

If you want to "accept any special character on the keyboard", you need to list them.
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Author Comment

by:evilmonkey2148
ID: 39999053
(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9!@#\$%\^&\*\(\)_\+-=\[\]{}\\\|;':",\./<>\?).{8,}

So that should work?
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39999069
Yup.
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