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<?php
    $str = 'this is my gal_s, not my 1_s not 2_s not 3_s';
    $repl = preg_replace('/(?<!\bgal)_s/', '', $str);
    echo $repl."\n";
?>

Success #stdin #stdout 0.01s 20520KB

stdin

Standard input is empty

stdout

this is my gal_s, not my 1 not 2 not 3

https://ideone.com/GeTsv3

language:

PHP (php 7.3.5)

created:

visibility:

public

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