/**
* Checks for noncompiling or dangerous regex
* @param array $rewrite rewrite arguments to be evaluated for dangerous or noncompiling regex
* @param string $domain the domain argument passed in the rewrite rules
* @param string $pattern regex pattern passed in the rewrite rules
* @param string $argmatch optional regex arg passed in rewrite rules
* @param string $replacement rewrite rule's replacement arg
* @param bool $quiet (Default: false) if false turns output buffering off and displays errors, true buffers outputs to keep unit-tests clean
* @return bool $skip if true, the regex didn't compile or dangerous regex was found and this rewrite will be skipped, if true the regex was safe
*/
public static function is_scary_regex($rewrite, $domain, $pattern, $argmatch, $replacement, $quiet = false)
{
$filterees = array($domain, $pattern, $argmatch);
$skip = false;
foreach ($filterees as $key) {
if (!isset($rewrite[$key])) {
continue;
}
if (!Patterns::check_for_noncompiled_regex_string($rewrite[$key], $quiet)) {
$skip = true;
}
if (!Patterns::reject_dangerous_regex_string($rewrite[$key], $quiet)) {
$skip = true;
}
}
if (!Patterns::reject_dangerous_regex_string($rewrite[$replacement], $quiet)) {
$skip = true;
}
return $skip;
}
