Added check in `rs_is_regular`; eliminated `rs_puiseux3`
Added check in `rs_is_regular`; eliminated `rs_puiseux3`

sampadsaha5/sympy,grevutiu-gabriel/sympy,skidzo/sympy,bukzor/sympy,Designist/sympy,bukzor/sympy,kevalds51/sympy,Shaswat27/sympy,jbbskinny/sympy,madan96/sympy,iamutkarshtiwari/sympy,aktech/sympy,iamutkarshtiwari/sympy,ga7g08/sympy,Curious72/sympy,souravsingh/sympy,jbbskinny/sympy,maniteja123/sympy,asm666/sympy,chaffra/sympy,abhiii5459/sympy,jerli/sympy,Davidjohnwilson/sympy,Arafatk/sympy,maniteja123/sympy,aktech/sympy,Arafatk/sympy,debugger22/sympy,Designist/sympy,atreyv/sympy,atsao72/sympy,saurabhjn76/sympy,toolforger/sympy,wyom/sympy,ahhda/sympy,moble/sympy,mafiya69/sympy,postvakje/sympy,rahuldan/sympy,jbbskinny/sympy,souravsingh/sympy,moble/sympy,oliverlee/sympy,wyom/sympy,kevalds51/sympy,farhaanbukhsh/sympy,lindsayad/sympy,kumarkrishna/sympy,garvitr/sympy,debugger22/sympy,jerli/sympy,ChristinaZografou/sympy,Titan-C/sympy,saurabhjn76/sympy,jerli/sympy,kaichogami/sympy,postvakje/sympy,asm666/sympy,madan96/sympy,sampadsaha5/sympy,atreyv/sympy,hargup/sympy,wanglongqi/sympy,Davidjohnwilson/sympy,Davidjohnwilson/sympy,sahmed95/sympy,aktech/sympy,jaimahajan1997/sympy,Gadal/sympy,wyom/sympy,atsao72/sympy,ChristinaZografou/sympy,jaimahajan1997/sympy,Curious72/sympy,cswiercz/sympy,yukoba/sympy,oliverlee/sympy,sahmed95/sympy,AkademieOlympia/sympy,pandeyadarsh/sympy,drufat/sympy,Vishluck/sympy,chaffra/sympy,ahhda/sympy,chaffra/sympy,shikil/sympy,kaichogami/sympy,ChristinaZografou/sympy,AkademieOlympia/sympy,Gadal/sympy,grevutiu-gabriel/sympy,rahuldan/sympy,kevalds51/sympy,MechCoder/sympy,emon10005/sympy,Shaswat27/sympy,oliverlee/sympy,ahhda/sympy,farhaanbukhsh/sympy,farhaanbukhsh/sympy,iamutkarshtiwari/sympy,toolforger/sympy,cswiercz/sympy,madan96/sympy,skidzo/sympy,Vishluck/sympy,jaimahajan1997/sympy,saurabhjn76/sympy,debugger22/sympy,bukzor/sympy,VaibhavAgarwalVA/sympy,wanglongqi/sympy,kaushik94/sympy,lindsayad/sympy,VaibhavAgarwalVA/sympy,grevutiu-gabriel/sympy,yashsharan/sympy,hargup/sympy,mcdaniel67/sympy,garvitr/sympy,kaushik94/sympy,pandeyadarsh/sympy,emon10005/sympy,mafiya69/sympy,toolforger/sympy,ga7g08/sympy,shikil/sympy,mafiya69/sympy,AkademieOlympia/sympy,kaichogami/sympy,yukoba/sympy,wanglongqi/sympy,Arafatk/sympy,Curious72/sympy,shikil/sympy,pandeyadarsh/sympy,kumarkrishna/sympy,rahuldan/sympy,Titan-C/sympy,yukoba/sympy,kumarkrishna/sympy,asm666/sympy,sampadsaha5/sympy,lindsayad/sympy,Titan-C/sympy,sahmed95/sympy,mcdaniel67/sympy,MechCoder/sympy,drufat/sympy,MechCoder/sympy,kaushik94/sympy,Shaswat27/sympy,postvakje/sympy,garvitr/sympy,ga7g08/sympy,atsao72/sympy,mcdaniel67/sympy,Designist/sympy,hargup/sympy,abhiii5459/sympy,maniteja123/sympy,emon10005/sympy,Gadal/sympy,Vishluck/sympy,VaibhavAgarwalVA/sympy,yashsharan/sympy,drufat/sympy,moble/sympy,abhiii5459/sympy,skidzo/sympy,cswiercz/sympy,atreyv/sympy,souravsingh/sympy,yashsharan/sympy