PHP Warning: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: unmatched parentheses at offset 31 in [PATH]/additional_images.php on line 54

What could cause that?

This is line 54

if(preg_match("/" . $products_image_base . "/i", $file) == 1) {



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