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<?php preg_match_all('/(_[\w]{1})/', "resource_id_heeelp_lala_klopsiki", $matches); print_r($matches);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [0] => _i [1] => _h [2] => _l [3] => _k ) [1] => Array ( [0] => _i [1] => _h [2] => _l [3] => _k ) )

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