Add warning in docs on performance when using EXSLT regexp functions
Add warning in docs on performance when using EXSLT regexp functions

haiiiiiyun/scrapy,ylcolala/scrapy,kmike/scrapy,starrify/scrapy,kmike/scrapy,stenskjaer/scrapy,finfish/scrapy,wzyuliyang/scrapy,chekunkov/scrapy,Adai0808/scrapy-1,ssteo/scrapy,dracony/scrapy,scorphus/scrapy,jdemaeyer/scrapy,pombredanne/scrapy,coderabhishek/scrapy,wujuguang/scrapy,fafaman/scrapy,Djlavoy/scrapy,ssh-odoo/scrapy,jdemaeyer/scrapy,profjrr/scrapy,wenyu1001/scrapy,redapple/scrapy,ramiro/scrapy,devGregA/scrapy,WilliamKinaan/scrapy,pfctdayelise/scrapy,dangra/scrapy,hyrole/scrapy,zorojean/scrapy,pranjalpatil/scrapy,nowopen/scrapy,yusofm/scrapy,mlyundin/scrapy,wzyuliyang/scrapy,codebhendi/scrapy,Lucifer-Kim/scrapy,Partoo/scrapy,tagatac/scrapy,JacobStevenR/scrapy,jeffreyjinfeng/scrapy,rolando-contrib/scrapy,raphaelfruneaux/scrapy,ssteo/scrapy,Digenis/scrapy,nikgr95/scrapy,ramiro/scrapy,ashishnerkar1/scrapy,hwsyy/scrapy,zjuwangg/scrapy,tliber/scrapy,olafdietsche/scrapy,Digenis/scrapy,yusofm/scrapy,jamesblunt/scrapy,dacjames/scrapy,eliasdorneles/scrapy,taito/scrapy,eLRuLL/scrapy,rklabs/scrapy,johnardavies/scrapy,1yvT0s/scrapy,pablohoffman/scrapy,eliasdorneles/scrapy,stenskjaer/scrapy,WilliamKinaan/scrapy,Djlavoy/scrapy,CodeJuan/scrapy,1yvT0s/scrapy,hwsyy/scrapy,godfreyy/scrapy,kalessin/scrapy,rootAvish/scrapy,kashyap32/scrapy,cleydson/scrapy,legendtkl/scrapy,mgedmin/scrapy,jeffreyjinfeng/scrapy,w495/scrapy,carlosp420/scrapy,ssteo/scrapy,foromer4/scrapy,hansenDise/scrapy,irwinlove/scrapy,Zephor5/scrapy,cursesun/scrapy,kazitanvirahsan/scrapy,Allianzcortex/scrapy,johnardavies/scrapy,barraponto/scrapy,nikgr95/scrapy,jiezhu2007/scrapy,farhan0581/scrapy,ssh-odoo/scrapy,YeelerG/scrapy,dgillis/scrapy,elacuesta/scrapy,livepy/scrapy,cyrixhero/scrapy,jc0n/scrapy,kimimj/scrapy,dgillis/scrapy,zorojean/scrapy,Chenmxs/scrapy,cursesun/scrapy,AaronTao1990/scrapy,taito/scrapy,snowdream1314/scrapy,avtoritet/scrapy,Djlavoy/scrapy,liyy7/scrapy,famorted/scrapy,OpenWhere/scrapy,z-fork/scrapy,agreen/scrapy,joshlk/scrapy,Allianzcortex/scrapy,darkrho/scrapy-scrapy,ylcolala/scrapy,nowopen/scrapy,aivarsk/scrapy,tagatac/scrapy,barraponto/scrapy,moraesnicol/scrapy,GregoryVigoTorres/scrapy,Geeglee/scrapy,umrashrf/scrapy,crasker/scrapy,yidongliu/scrapy,crasker/scrapy,yidongliu/scrapy,rolando/scrapy,hyrole/scrapy,rahulsharma1991/scrapy,ashishnerkar1/scrapy,scrapy/scrapy,tntC4stl3/scrapy,darkrho/scrapy-scrapy,ssh-odoo/scrapy,IvanGavran/scrapy,AaronTao1990/scrapy,livepy/scrapy,godfreyy/scrapy,Parlin-Galanodel/scrapy,mgedmin/scrapy,CENDARI/scrapy,agreen/scrapy,OpenWhere/scrapy,agreen/scrapy,bmess/scrapy,eLRuLL/scrapy,codebhendi/scrapy,pablohoffman/scrapy,TarasRudnyk/scrapy,fontenele/scrapy,pranjalpatil/scrapy,Adai0808/scrapy-1,carlosp420/scrapy,pfctdayelise/scrapy,pablohoffman/scrapy,beni55/scrapy,Chenmxs/scrapy,nfunato/scrapy,darkrho/scrapy-scrapy,wangjun/scrapy,Timeship/scrapy,hwsyy/scrapy,tliber/scrapy,redapple/scrapy,gbirke/scrapy,cyberplant/scrapy,smaty1/scrapy,beni55/scrapy,z-fork/scrapy,kazitanvirahsan/scrapy,ENjOyAbLE1991/scrapy,webmakin/scrapy,livepy/scrapy,TarasRudnyk/scrapy,Cnfc19932/scrapy,arush0311/scrapy,umrashrf/scrapy,scrapy/scrapy,fpy171/scrapy,amboxer21/scrapy,Bourneer/scrapy,lacrazyboy/scrapy,smaty1/scrapy,Slater-Victoroff/scrapy,URXtech/scrapy,huoxudong125/scrapy,rolando/scrapy,wujuguang/scrapy,curita/scrapy,Cnfc19932/scrapy,ArturGaspar/scrapy,foromer4/scrapy,codebhendi/scrapy,Geeglee/scrapy,Parlin-Galanodel/scrapy,kalessin/scrapy,chekunkov/scrapy,jamesblunt/scrapy,haiiiiiyun/scrapy,Ryezhang/scrapy,github-account-because-they-want-it/scrapy,wangjun/scrapy,URXtech/scrapy,webmakin/scrapy,zackslash/scrapy,sigma-random/scrapy,Cnfc19932/scrapy,dracony/scrapy,carlosp420/scrapy,wzyuliyang/scrapy,eliasdorneles/scrapy,Allianzcortex/scrapy,hansenDise/scrapy,URXtech/scrapy,rootAvish/scrapy,lacrazyboy/scrapy,OpenWhere/scrapy,profjrr/scrapy,Partoo/scrapy,Bourneer/scrapy,jorik041/scrapy,1yvT0s/scrapy,scrapy/scrapy,scorphus/scrapy,arush0311/scrapy,agusc/scrapy,finfish/scrapy,fpy171/scrapy,CENDARI/scrapy,profjrr/scrapy,zhangtao11/scrapy,jorik041/scrapy,snowdream1314/scrapy,rootAvish/scrapy,dhenyjarasandy/scrapy,Ryezhang/scrapy,github-account-because-they-want-it/scrapy,devGregA/scrapy,Geeglee/scrapy,songfj/scrapy,webmakin/scrapy,curita/scrapy,hyrole/scrapy,tliber/scrapy,liyy7/scrapy,ArturGaspar/scrapy,KublaikhanGeek/scrapy,taito/scrapy,CENDARI/scrapy,barraponto/scrapy,agusc/scrapy,yidongliu/scrapy,shaform/scrapy,ENjOyAbLE1991/scrapy,pawelmhm/scrapy,csalazar/scrapy,starrify/scrapy,cyberplant/scrapy,moraesnicol/scrapy,aivarsk/scrapy,nfunato/scrapy,crasker/scrapy,bmess/scrapy,sardok/scrapy,Digenis/scrapy,raphaelfruneaux/scrapy,olorz/scrapy,scorphus/scrapy,JacobStevenR/scrapy,songfj/scrapy,Lucifer-Kim/scrapy,legendtkl/scrapy,olafdietsche/scrapy,rolando/scrapy,xiao26/scrapy,jiezhu2007/scrapy,Bourneer/scrapy,dhenyjarasandy/scrapy,cleydson/scrapy,CodeJuan/scrapy,fafaman/scrapy,hectoruelo/scrapy,elacuesta/scrapy,cyberplant/scrapy,AaronTao1990/scrapy,nowopen/scrapy,cyrixhero/scrapy,fpy171/scrapy,tntC4stl3/scrapy,raphaelfruneaux/scrapy,legendtkl/scrapy,Zephor5/scrapy,lacrazyboy/scrapy,YeelerG/scrapy,kimimj/scrapy,irwinlove/scrapy,haiiiiiyun/scrapy,yusofm/scrapy,huoxudong125/scrapy,IvanGavran/scrapy,arush0311/scrapy,Zephor5/scrapy,wujuguang/scrapy,amboxer21/scrapy,TarasRudnyk/scrapy,ArturGaspar/scrapy,csalazar/scrapy,fafaman/scrapy,w495/scrapy,devGregA/scrapy,zackslash/scrapy,xiao26/scrapy,farhan0581/scrapy,cleydson/scrapy,starrify/scrapy,ylcolala/scrapy,liyy7/scrapy,Preetwinder/scrapy,rklabs/scrapy,famorted/scrapy,rahulsharma1991/scrapy,fqul/scrapy,wangjun/scrapy,wenyu1001/scrapy,Ryezhang/scrapy,kashyap32/scrapy,kashyap32/scrapy,dacjames/scrapy,coderabhishek/scrapy,Slater-Victoroff/scrapy,stenskjaer/scrapy,yarikoptic/scrapy,rdowinton/scrapy,nguyenhongson03/scrapy,mlyundin/scrapy,zhangtao11/scrapy,godfreyy/scrapy,pranjalpatil/scrapy,zhangtao11/scrapy,shaform/scrapy,JacobStevenR/scrapy,GregoryVigoTorres/scrapy,elijah513/scrapy,rolando-contrib/scrapy,coderabhishek/scrapy,KublaikhanGeek/scrapy,nfunato/scrapy,mgedmin/scrapy,github-account-because-they-want-it/scrapy,kimimj/scrapy,hbwzhsh/scrapy,KublaikhanGeek/scrapy,ramiro/scrapy,joshlk/scrapy,foromer4/scrapy,elijah513/scrapy,WilliamKinaan/scrapy,hectoruelo/scrapy,rahulsharma1991/scrapy,yarikoptic/scrapy,jdemaeyer/scrapy,zorojean/scrapy,gbirke/scrapy,olorz/scrapy,hansenDise/scrapy,bmess/scrapy,wenyu1001/scrapy,olorz/scrapy,farhan0581/scrapy,kalessin/scrapy,mlyundin/scrapy,rdowinton/scrapy,heamon7/scrapy,avtoritet/scrapy,pawelmhm/scrapy,jiezhu2007/scrapy,Timeship/scrapy,fontenele/scrapy,kmike/scrapy,curita/scrapy,jc0n/scrapy,umrashrf/scrapy,huoxudong125/scrapy,fontenele/scrapy,yarikoptic/scrapy,beni55/scrapy,agusc/scrapy,heamon7/scrapy,Timeship/scrapy,elacuesta/scrapy,kazitanvirahsan/scrapy,YeelerG/scrapy,finfish/scrapy,dangra/scrapy,eLRuLL/scrapy,heamon7/scrapy,nguyenhongson03/scrapy,CodeJuan/scrapy,hectoruelo/scrapy,nguyenhongson03/scrapy,dgillis/scrapy,Lucifer-Kim/scrapy,dracony/scrapy,Adai0808/scrapy-1,Slater-Victoroff/scrapy,zjuwangg/scrapy,cyrixhero/scrapy,hbwzhsh/scrapy,amboxer21/scrapy,dacjames/scrapy,avtoritet/scrapy,GregoryVigoTorres/scrapy,smaty1/scrapy,fqul/scrapy,ENjOyAbLE1991/scrapy,pfctdayelise/scrapy,fqul/scrapy,zackslash/scrapy,zjuwangg/scrapy,w495/scrapy,tntC4stl3/scrapy,joshlk/scrapy,cursesun/scrapy,redapple/scrapy,johnardavies/scrapy,Preetwinder/scrapy,IvanGavran/scrapy,aivarsk/scrapy,Preetwinder/scrapy,rolando-contrib/scrapy,rklabs/scrapy,pombredanne/scrapy,pombredanne/scrapy,tagatac/scrapy,pawelmhm/scrapy,csalazar/scrapy,famorted/scrapy,Partoo/scrapy,irwinlove/scrapy,dhenyjarasandy/scrapy,hbwzhsh/scrapy,shaform/scrapy,jc0n/scrapy,sigma-random/scrapy,jeffreyjinfeng/scrapy,z-fork/scrapy,snowdream1314/scrapy,chekunkov/scrapy,Parlin-Galanodel/scrapy,sardok/scrapy,jorik041/scrapy,xiao26/scrapy,moraesnicol/scrapy,songfj/scrapy,Chenmxs/scrapy,elijah513/scrapy,olafdietsche/scrapy,dangra/scrapy,nikgr95/scrapy,rdowinton/scrapy