php Dollar amount Regular Expression

Posted by Thildemar on Stack Overflow See other posts from Stack Overflow or by Thildemar
Published on 2010-05-12T21:08:55Z Indexed on 2010/05/12 21:14 UTC
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regex

I am have completed javascript validation of a form using Regular Expressions and am now working on redundant verification server-side using PHP.

I have copied this regular expression from my jscript code that finds dollar values, and reformed it to a PHP friendly format:

/\$?((\d{1,3}(,\d{3})*)|(\d+))(\.\d{2})?$/

Specifically:

if (preg_match("/\$?((\d{1,3}(,\d{3})*)|(\d+))(\.\d{2})?$/", $_POST["cost"])){}

While the expression works great in javascript I get :

Warning: preg_match() [function.preg-match]: Compilation failed: nothing to repeat at offset 1

when I run it in PHP. Anyone have a clue why this error is coming up?

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