explain regex and make it a bit simpler
explain regex and make it a bit simpler

crruthe/MISP,FIRSTdotorg/MISP,crruthe/MISP,FloatingGhost/MISP,Rafiot/MISP,RichieB2B/MISP,FloatingGhost/MISP,devnull-/MISP,Rafiot/MISP,Rafiot/MISP,MISP/MISP,crruthe/MISP,MISP/MISP,TheDr1ver/MISP,MISP/MISP,cristianbell/MISP,MISP/MISP,SteveClement/MISP,TheDr1ver/MISP,SteveClement/MISP,devnull-/MISP,Rafiot/MISP,MISP/MISP,crruthe/MISP,TheDr1ver/MISP,cristianbell/MISP,cristianbell/MISP,TheDr1ver/MISP,SteveClement/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,SteveClement/MISP,RichieB2B/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,SteveClement/MISP,RichieB2B/MISP,FIRSTdotorg/MISP,RichieB2B/MISP,cristianbell/MISP,devnull-/MISP,devnull-/MISP