PHP preg_match URL Segment Not Working

Question

I have a string:

https://domain.tld/123456/api/v1/projects/45242457-foo-bar.json

And I'm trying to match '45242457-foo-bar' using:

preg_match('~"/projects/(.*).json"~', $url, $matches, PREG_OFFSET_CAPTURE);

This keeps returning zero matches. Why?

Consider using parse_url() (php.net/manual/en/function.parse-url.php) to get info about urls. It is a much easier and better solution than a regex. — Cfreak
– Cfreak, Commented Mar 19, 2013 at 17:05
Great questions. I saw another SO post where it said preg_match required delimiters around the pattern. I'll try to find it ... — doremi
– doremi, Commented Mar 19, 2013 at 17:09
@doremi You have delimiters around your pattern. The tildes (~) are your delimiters in this case — Colin M
– Colin M, Commented Mar 19, 2013 at 17:09

John Conde · Accepted Answer · 2013-03-19 17:04:59Z

2

You need to escape your period (and a greedy *):

~"/projects/(.*?)\.json"~

answered Mar 19, 2013 at 17:04

John Conde

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4 Comments

DaveRandom Over a year ago

He does, but that's not the cause of the problem, the cause is a greedy *

John Conde Over a year ago

Overlooked that. Regex modified accordingly.

Colin M Over a year ago

@DaveRandom Actually not a problem here. Works just fine leaving the asterisk as-is. The problem is actually the double quotes. Just fixing that makes this work. Although I agree the . should be escaped to stick with what the OP is trying to do

doremi Over a year ago

Would be more helpful to put the entire solution (this works) preg_match('~/projects/(.*?)\.json~', $project->url, $matches, PREG_OFFSET_CAPTURE);

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