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<?php var_dump(preg_replace('/^((?<=-)?(0+)/', "" , "-0010px"));
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: preg_replace(): Compilation failed: missing closing parenthesis at offset 13 in /in/krgvI on line 4 NULL
Output for 5.3.19 - 5.3.29, 5.4.9 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Warning: preg_replace(): Compilation failed: missing ) at offset 13 in /in/krgvI on line 4 NULL
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 - 5.3.18, 5.4.0 - 5.4.8
Warning: preg_replace(): Compilation failed: nothing to repeat at offset 8 in /in/krgvI on line 4 NULL
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 8 in /in/krgvI on line 4 NULL

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253.68 ms | 401 KiB | 342 Q