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php + validating a password in a form

sleepyescapade · 2008-06-19 08:36:11

Hi there, I'm creating a form to register a user, I'd like the user's password to be alphanumeric, and if its not, to display an error message. I can't seem to find any functions that deal with this in a simple way. Anyone have any ideas/suggestions I'd really appreciate it :)

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19-06-2008 9:36am

#1

sleepyescapade

Registered Users Posts: 788 ✭✭✭

Join Date: September 2007

Posts: 649

Hi there,

I'm creating a form to register a user, I'd like the user's password to be alphanumeric, and if its not, to display an error message. I can't seem to find any functions that deal with this in a simple way. Anyone have any ideas/suggestions I'd really appreciate it

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#2 19-06-2008 9:50am
seamus

Registered Users Posts: 68,317 ✭✭✭✭

Join Date: July 2001

Posts: 67070

preg_match() would probably be your man. Have a look at regular expressions.

The Regex

/^[A-Za-z0-9]*$/ will match all alphanumeric strings.

It can also be written as /^[:alnum:]*$/ but for some reason I find the former easier to read.

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