升级Wamp后preg_match失败

Question

To prevent malicious users from trying to exploit keys we make sure that keys are only named with alpha-numeric text and a few other items, using preg_match.

This is the code:

if (!preg_match('#^[&a-zA-Z0-9\.:_/-\s]+$#uD', $str)) {
    exit('String not valid:' . $str);
}

This function working well until the last week, when the customer update WAMP on test server. Using string as dverse.session, the code enter in EXIT(). I've checked the regular expression with http://www.phpliveregex.com/ but the regular expression is working well. What could be the problem?

Answer 1

You should have minus sign escaped in the regex:

if (!preg_match('#^[&a-zA-Z0-9\.:_/\-\s]+$#uD', $str)) {
    exit('String not valid:' . $str);
}