PHP - Perl compatible regexp

Question

How do I turn this regexp

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

into a Perl compatible regexp required by PHP in the filter_var function under FILTER_VALIDATE_REGEXP?

If I just add it to the options as-is I get this error: filter_var() [function.filter-var]: Unknown modifier '+' in ...

I'd love it if those who downvoted this explained themselves a bit so I don't make the same mistake again. — Swader, Apr 07 '12 at 12:05

score 2 · Accepted Answer · 2012-04-07T12:08:21.517

2

You need to wrap the expression with a delimiter (/ is most commonly used):

/[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/

edited Apr 07 '12 at 12:08

answered Apr 07 '12 at 12:01

2

And escape all occurences of said delimiter in the regex body. – DCoder Apr 07 '12 at 12:03
2

Have you actually tried that regex? – DCoder Apr 07 '12 at 12:06
That worked, thanks, and escaping was necessary, DCoder was right. – Swader Apr 07 '12 at 12:07
2

@DCoder: My mistake, could have sworn it wasn't required. Thanks for the heads-up! – Apr 07 '12 at 12:09

1 Answers1