wp-includes > class-wp.php error warning

Does anybody know what this is? (see below)
It happened after updating theme and WordPress version.
I have tried all usual steps to search for the error – deactivating all plugins, theme etc.
The warning comes when activating theme -is it a theme problem?
I tried downgrading to previous edition of theme – didn’t solve anything.
It’s a WP-file – so, is it a wordpress problem?

Can anyone help?

Warning: preg_match() [function.preg-match] :Compilation failed: quantifier does not follow a repeatable item at offset 1 in /var/www/broderist.com/public_html/wp-includes/class-wp.php on line 223

Opening that file it looks like this on line 223 and 224:

if ( preg_match ( “#^$match#” , $request_match , $matches ) ||
preg_match ( “#^$match#” , urldecode ( $request_match ) , $matches )) {

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