php - Matching 3 last numbers in a string with regex -

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problem:

trying highlight last 3 numbers in string using regular expression.

code:

<?php     show_source('regex.php');      $string = "         780155overf i000000         tranfer domestic         000114         sthlm se ab     "; ?> <!doctype html> <html>     <head>         <title>regex match last 3 numbers</title>         <meta charset="utf-8">     </head>     <body>         <?php             echo nl2br(str_replace('/\d{3}(?=[^\d]+$)/g', '<span style="background-color:red;">$1</span>', $string));         ?>     </body> </html>

desired outcome:

the numbers 114 should have red background color.

use:

print nl2br(         preg_replace('/\d{3}(?=[^\d]+$)/s',                       '<span style="background-color:red;">$0</span>',                       $string)            );

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