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<?php $string = 'PT3M'; $pattern = 'PT?[0-9]+[SMWYD]'; $replacement = '#'; echo preg_replace($pattern, $replacement, $string);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Delimiter must not be alphanumeric, backslash, or NUL in /in/upkpE on line 6

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