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<?php $str = "a".str_repeat("\xCC\x8A", 100000); var_dump( 1 === preg_match_all('/\X/u', $str), 1 === preg_match_all('/(?>\PM\pM*)/u', $str) );
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true)

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