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@ 2018-08-30T19:37:55Z

<?php

$string = "lgx sinx cosx textxtanxsinx";
$patternReplace = preg_replace("/(lg|sin|cos)x/", "$1(x)", $string);
   
print $patternReplace;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

29.28 ms | 404 KiB | 5 Q