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<?php var_dump(preg_replace('/(\#gf\_form\_\d+)/', '$1', 'jQuery("#gf_form_1")'));
based on qe4g1
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(20) "jQuery("#gf_form_1")"