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@ 2017-07-09T21:05:11Z

<?php

function get_numerics ($str) {
    preg_match('/^mom_\d+/', $str, $matches);
    return $matches[0];
}

$one = 'mom_5';
$two = 'mom_123';
$three = 'actions';

print_r(get_numerics($one));
print_r(get_numerics($two));
print_r(get_numerics($three));

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

48.7 ms | 402 KiB | 5 Q