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

Question

I keep getting this error about 20 times in my wordpress blog about the same line of code. Here is the line of code that keeps getting the error.

if ( preg_match( '/' . $id_base . '-([0-9]+)$/', $widget_id, $matches ) )
        $number = max($number, $matches[1]);

What could be wrong?

score 5 · Accepted Answer · answered Mar 16 '11 at 04:36

5

Your regex will break if the string $id_base has a / in it as you are using / as the regex delimiter.

To fix this use preg_quote on $id_base as:

if (preg_match('/'. preg_quote($id_base,'/').'-([0-9]+)$/', .....) {

answered Mar 16 '11 at 04:36

codaddict

so use 'preg_quote' instead of '$id_base'? how would you rewrite the line? – Frank Aguilar Mar 16 '11 at 04:40
@Frank: My answer has the usage. – codaddict Mar 16 '11 at 04:41
whoops, sorry didnt see it. LOL – Frank Aguilar Mar 16 '11 at 04:42

1 Answers1