I still don't get regex. Just want to check a simple one...

[Jessica]

I want to check that a string contains a letter and a number. I figured the simplest way for ME to do it is check it contains one letter, and then check if it contains a number, and if both are true, it's good.

 

I just still don't get regex.

 

<?
print preg_match('/[a-zA-Z]+[0-9]+/', $value);
?>

 

What am I doing wrong? I put "test1" as $value and still get 0?

[Mchl]

I get 1 from this:

$value = 'test1';
print preg_match('/[a-zA-Z]+[0-9]+/', $value);

[Jessica]

Sorry, what it wasn't matching was: 1test.

 

This is the new expression that matches 1test and test1 and test1test so I think it will work. Can it be simplified any?

 

/([a-zA-Z])+([0-9])+|([0-9])+([a-zA-Z])+/

[Mchl]

Yes.

 

/[a-zA-Z0-9]+/

 

 

[edit]

Oh wait... you wanted to match at least one letter and at least one number, so scrap that.

[Jessica]

Right, I know how to check for a letter OR a number, but I want both.

 

(password strenth!)

[premiso]

I recall that there is a way, but if you are doing password strength you want to let the user know what is missing, so why not just seperate them out into their own if statements, that way you know what is missing and can inform the user of it so they can properly fix it...

 

I have some code, but it is on a different PC at home, when I get home, if I remember, I will post my code for a password strength checker (it was made for AJAX).

[Mchl]

If it's for password strength I would do separate preg_match for letter and another for number.

Basing in this, you can send feedback to user telling them to use at least one letter/number

[Jessica]

The error message just says "Must contain at least one letter and one number" - I think that's clear enough... I might change it later tho if I find it's confusing, thanks :)

[Daniel0]

To be honest, I would probably just do

if (!preg_match('#[0-9]#', $password) || !preg_match('#[a-z]#i', $password)) {
    echo 'fail';
}