Using regex in PHP

I tried this:

$mtcDatum = preg_match("/[0-9]{2}/[0-9]{2}/[0-9]{4}/", $lnURL);

This returns an error message:

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Warning: preg_match() [function.preg-match]: Unknown modifier '['

Why doesn't this work? I'm used to Linux's way of doing regex, does PHP handle regex differently?

PHP syntax is interpreting the "/" character as the end of your pattern. You need to escape the forward slashes:

preg_match("/[0-9]{2}\/[0-9]{2}\/[0-9]{4}/", $lnURL);

You need a delimiter character around your pattern (this is what separates the pattern from any modifiers). Normally / is used, but as this is part of the string you are trying to match, you can use another character such as #:

$mtcDatum = preg_match("#[0-9]{2}/[0-9]{2}/[0-9]{4}#", $lnURL);