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<?php $toks = [ '\bwaiting\b', '^\w+', '\bresponse\b', '\bfrom\b', '\|', '\bto\b', ]; $pattern = '/' . implode('|', $toks) . '/i'; var_export(preg_match_all($pattern, "I'm waiting for a response from", $out) ? $out[0] : null);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'I', 1 => 'waiting', 2 => 'response', 3 => 'from', )

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