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<?php $str = 'e ,a\\,b\\\\,c\\\\\\,d\\\\'; preg_match_all("/(?<=(INVO[a-z]+\sNO\s))(\d+)\b/i","INVOCE NO 234", $matches); var_dump($matches[0]);
Output for git.master, git.master_jit
Warning: preg_match_all(): Compilation failed: lookbehind assertion is not fixed length at offset 0 in /in/SO68q on line 3 Warning: Trying to access array offset on value of type null in /in/SO68q on line 4 NULL
Output for rfc.property-hooks
Warning: preg_match_all(): Compilation failed: lookbehind assertion is not fixed length at offset 0 in /in/SO68q on line 3 Warning: Trying to access array offset on null in /in/SO68q on line 4 NULL

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