[PHP] Regex and variable usage

[Curt Zirzow]

Gerard Samuel <gsam@trini0.org> wrote:

> Has anyone had any success with using variables in a regex shown below??
>
> $foo = 3;
> $bar = 4;
> preg_match('/^[a-z0-9\-_\.]+\.[a-z0-9]{$foo, $bar}$/', $some_string)

You have single quotes, so php wont expand the variables inside.

>
> or even
> preg_match('/^[a-z0-9\-_\.]+\.[a-z0-9]{' . $foo . ', ' . $bar . '}$/',
> $some_string)

that should work.

but you could do this:
$pattern = "/^[a-z0-9\-_\.]+\.[a-z0-9]{$foo, $bar}\$/";
preg_match($pattern, $some_string)

> but this would work
> preg_match('/^[a-z0-9\-_\.]+\.[a-z0-9]{3,4}$/', $some_string)
>
> Thanks for any pointers..

Curt
--

[Unregistered]

You can use preg_match

preg_match ( pattern, subject [, matches [, flags [, offset]]])

where pattern could ve a String variable.

Source: [url]http://www.webcheatsheet.com/php/regular_expressions.php[/url]