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<?php $pattern = '\d+'; $haystack = '0123 456 789'; preg_replace_callback($pattern, 'add_three', $haystack); function add_three($matches){ return '777'; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace_callback(): Delimiter must not be alphanumeric, backslash, or NUL in /in/OlOSv on line 6

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