regular expression - password policy enforcement

Posted on 2010-08-24
Last Modified: 2012-05-10
Hello Experts,

I need a regular expression string that matches (1 capitol, 1 lowercase, 1 number, 1 special character)

I had this:

which seemed to be working until I added the '#' character to the string at which point it quits. Unfortunately this problem got missed until about a week away from production so I am reaching out...

Any help appreciated!
I am using this expression with the PCRE engine.
Question by:glo-dba
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LVL 20

Accepted Solution

alainbryden earned 500 total points
ID: 33510079
This regular expression seems to have everything you need. If you don't require at least 10 characters you can remove that first part:


    * Must be at least 10 characters
    * Must contain at least one one lower case letter, one upper case letter, one digit and one special character
    * Valid special characters (which are configurable) are -   @#$%^&+=

LVL 20

Expert Comment

ID: 33510106
Well it looks like your problem might be that in the PCRE documentation, comments are delimited by the # mark. Maybe you need to escape it by using it twice? (##)
LVL 20

Expert Comment

ID: 33510120
I stand corrected, apparently using \# to escape the hash character should take care of it.
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LVL 20

Expert Comment

ID: 33510133
Here's the man page for your reference:
The relevant section for the # problem has the header "BACKSLASH"

Expert Comment

ID: 33510198
By the way, you may also want to escape $ sign, otherwise Perl will expand $^ variable.

Author Closing Comment

ID: 33542841
Your string works fine. My string doesn't work. It may be may an inconsistency in the "regex buddy" PRCE engine.

Thank you very much!

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