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<?php function dumpMatches(string $regex, string $value): void { echo $regex . "\n"; if (preg_match($regex, $value, $matches) !== 1) { echo "no match\n"; } else { var_dump($matches); } echo "\n"; } dumpMatches('~a\Kb~', 'ab'); dumpMatches('~a\Kb~', 'b'); dumpMatches('~(a)\Kb~', 'ab'); dumpMatches('~(a\K)b~', 'ab');
Output for git.master, git.master_jit
~a\Kb~ array(1) { [0]=> string(1) "b" } ~a\Kb~ no match ~(a)\Kb~ array(2) { [0]=> string(1) "b" [1]=> string(1) "a" } ~(a\K)b~ array(2) { [0]=> string(1) "b" [1]=> string(1) "a" }

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