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<?php $string = "lgx sinx cosx textxtanxsinx"; $patternReplace = preg_replace("/(lg|sin|cos)+(x)/", "$1($2)", $string); print $patternReplace;
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
lg(x) sin(x) cos(x) textxtanxsin(x)

preferences:
53.06 ms | 407 KiB | 5 Q