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<?php var_dump(preg_replace('/(.*jQuery\(("|\'))#(gf_form_\d+)(\2\).*)/', '$1[id=$3]$4', 'blah blah blah jQuery("#gf_form_1") doo dod do jQuery("#gf_form_2")'));
based on 3WNXc
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(71) "blah blah blah jQuery("#gf_form_1") doo dod do jQuery("[id=gf_form_2]")"