Invalid regex syntax causes infinite redirects

[devinellis]

I accidentally added a redirect with a trailing pipe character. This caused it to infinite redirect ALL retour redirects, it seems. I recommend adding some sort of syntax validation before allowing the user to save a static Regex redirect, like:

preg_match('~InvalidRegular)Expression~', null) === false

from http://stackoverflow.com/questions/4440626/how-can-i-validate-regex

[khalwat]

Ouch. Preflighting certainly seems like a good idea to me.