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<?php var_dump(preg_replace('/.*(jQuery\(("|\')#(gf).*/', '$1', 'jQuery("#gf_form_1")'));
based on rZoMU
Output for 4.3.11 - 7.1.0
Warning: preg_replace(): Compilation failed: missing ) at offset 23 in /in/Q6hKd on line 2 NULL
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: missing ) at offset 23 in /in/Q6hKd on line 2 NULL