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<?php var_dump(preg_replace("/^[^a-zA-Z]+|[!#$%&'* +/=?^\`{\|\}\~]+/", "",'_(32jkashdfkj$#!!&&')); var_dump( preg_replace( '|[^a-z0-9_.\-@]|i', '', '_(32jkashdfkj$#!!&&' ));
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_replace(): Unknown modifier '=' in /in/l7JOm on line 2 NULL string(12) "_32jkashdfkj"
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '=' in /in/l7JOm on line 2 NULL string(12) "_32jkashdfkj"

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212.3 ms | 401 KiB | 309 Q