I'm measuring reaction for an RFC

Essentially right now preg regex's fail silently - and you have to
actually check them manually with preg_last_error - something I've
never actually seen done in code.

see:

https://github.com/php/php-src/pull/2910
https://bugs.php.net/bug.php?id=70110
https://bugs.exim.org/show_bug.cgi?id=1663

I'd like to propose that, in line with the recent JSON changes, the
preg methods be made to throw exceptions (or at the very least -
warnings) rather than fail silently as I believe this is a bad
behaviour.

I personally do not have the low level coding knowledge needed to do
this, nor do I personally know anyone who does, so I would be
submitting this as a "concept"


Thank you ahead of time!

This will be my first RFC submission, so I hope I'm doing this right.

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