Filter a flat array by another flat array containing regex patterns

Question

I have two arrays like this:

$arr1 = ['/^under.*/', '/^develop.*/', '/^repons*/'];
$arr2 = ['understand', 'underconstruction', 'developer', 'develope', 'hide', 'here', 'some'];

I want to match the two arrays and return an array of words starting with the patterns in $arr1.

How do I do this in PHP?

Answer 1

This should work for you:

<?php

    $arr1 = array('/^under.*/','/^develop.*/','/^repons*/');
    $arr2 = array('understand','underconstruction','developer','develope','hide','here','some');
    $result = array();

    foreach($arr1 as $pattern) {

        foreach($arr2 as $value) {

            if(preg_match_all($pattern, $value, $matches))
                $result[] = $matches[0][0];
        }

    }

    print_r($result);

?>

Output:

Array ( [0] => understand [1] => underconstruction [2] => developer [3] => develope )