On 2/14/06, Patrick <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I am trying to validate a password, but havent figured out the pattern for
> it yet.
> The password must contain atleast 6 characters
> a-zA-Z0-9_
> must start with a
> a-zA-Z
> and must have atleast one of the following characters
> !#%&$£
As Curt said, it's probably better to do this programatically - if
only so you can work out what it's doing six months down the road.
However if you want to know to do it as a regexp:
start with the letters a-z.
^[a-z]
At least 5 legal characters following that (use a lookahead assertion
to check):
(?=[!#%&$£\w]{5})
Zero or more non-punctuation characters, followed by a a punctuation
character, followed zero or more of any valid character.
\w*[!#%&$£][!#%&$£\w]*
And then anchor the end of the string with a $.
Put all that together with a bit of case insensitivity and you get.
$regexp = '/^[a-z](?=[!#%&$£\w]{5})\w*[!#%&$£][!#%&$£\w]*$/i';
$status = preg_match($regexp, $password) ? 'PASS' : 'FAIL';
-robin
