Extract last instance of a regular expression from string in PHP

Question

I have a URL that is in the following structure: http://somewebsite.com/directory1/directory2/directory3...

I'm trying to get the last directory name from this url, but the depth of the url isn't always constant so i don't think i can use a simple substr or preg_match call - is there a function to get the last instance of a regular expression match from a string?

It looks like basename would be sufficient here? If not, what is the regex in question? — Jon
– Jon, Commented Dec 16, 2011 at 14:23

dplante · Accepted Answer · 2013-02-17 22:05:12Z

4

Just use:

basename( $url )

It should have the desired effect

edited Feb 17, 2013 at 22:05

dplante

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answered Dec 16, 2011 at 14:23

DarkDevine

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mcrumley · Accepted Answer · 2011-12-16 15:49:33Z

1

Torben's answer is the correct way to handle this specific case. But for posterity, here is how you get the last instance of a regular expression match:

preg_match_all('/pattern/', 'subject', $matches, PREG_SET_ORDER);
$last_match = end($matches); // or array_pop(), but it modifies the array

$last_match[0] contains the complete match, $last_match[1] contains the first parenthesized subpattern, etc.

Another point of interest: your regular expression '/\/([^/])$/' should work as-is because the $ anchors it to the end.

answered Dec 16, 2011 at 15:49

mcrumley

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