PHP Regex Replace Number in String

Question

I'm trying to replace a number in a string with another number by using regex. This should be super simple, but for some reason it's giving me grief today. "feed" in the string is dynamic and can contain letters or numbers only.

Here is what I've tried:

$new_number = 999;
$string = '/feed/page/1/?param=true';
preg_replace('/\/([0-9a-z])\/page\/([0-9])\/(.*)/i', '/$1/page/'.$new_number.'/$3', $string);

Should output: '/feed/page/999/?param=true'

As a side note, you can use other characters than / to delimit regex. '@/([0-9a-z]+)/page/([0-9]+)/(.*)@i' is sexier than '/\/([0-9a-z]+)\/page\/([0-9]+)\/(.*)/i'. — Gras Double
– Gras Double, Commented Mar 11, 2013 at 2:09

ericmux · Accepted Answer · 2013-03-11 01:12:48Z

2

forgetting the +'s, are you? :P Try this as your regEx:

'/\/([0-9a-z]+)\/page\/([0-9]+)\/(.*)/i'

answered Mar 11, 2013 at 1:12

ericmux

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Richard Brown · Accepted Answer · 2013-03-11 01:01:38Z

1

Try this:

\/([0-9a-z]{1,})\/page\/([0-9]{1,})\/(.*)

answered Mar 11, 2013 at 1:01

Richard Brown

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