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<?php preg_match('~a(?=\Kb)~', 'abc', $matches); print_r($matches);
Output for git.master_jit, git.master
Warning: preg_match(): Compilation failed: \K is not allowed in lookarounds (but see PCRE2_EXTRA_ALLOW_LOOKAROUND_BSK) at offset 8 in /in/ofZ7i on line 3

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