Question

Hi I would like to get all numbers after the last instance of – in php

my code is like so at the moment

$results = array();       
    $pattern = '/[^\-]*$/';       
    $pattern_no_chars ="[!0-9]";
    preg_match($pattern, $alias_title, $matches);         

    if(count($matches) <1){
        return $results;
    }

    $last_id = end($matches);
    $id_no_char = preg_replace($pattern_no_chars, '', $last_id);   

For example a url may be /image/view?alias_title=birkenhead-park-15-v-lymm-49-00601jpg-6514

in this case i would want 6514

Answer 1

You can also use

preg_match('~(?<=-)\d+$~',$str,$m);
if (!empty($m)) echo $m[0];

Here’s the breakdown:

(?<=-)  # last character before the match should be a dash
\d+     # 1 or more decimals (aka. the matched part)
$       # end of string

And here’s an example

$str = '/view?alias_title=network-warringtons-optare-versa-hybrid-yj62fkl-102-1593';
preg_match('~(?<=-)\d+$~',$str,$m);
if (!empty($m)) echo $m[0];

Finally, here’s the output: 1593