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<?php $a="abc123"; var_dump(mb_ereg_replace("123","def\\",$a)));
Output for 7.1.25, 7.2.0 - 7.2.13, 7.3.0 - 7.3.1
Parse error: syntax error, unexpected ')' in /in/6Xqcr on line 4
Process exited with code 255.
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179.51 ms | 1395 KiB | 24 Q