Validate vhosts names more strictly
Validate vhosts names more strictly

There was a bug in the setup page where valid domains that start with a number
would be captured by the validation check designed to detect IP
addresses. This check detects IPs by comparing the host name to a regex,
instead of simply detecting whether the first character is a number.

leonardodino/dokku,ignlg/dokku,hbouvier/dokku,expa/dokku,jimeh/dokku,sebastianscatularo/dokku,callahad/dokku,barseghyanartur/dokku,frog/dokku,suxor42/dokku,crisward/dokku,mrluc/dokku,econya/dokku,gianpaj/dokku,elia/dokku,bobvanderlinden/dokku,Cactusbone/dokku,Git-Host/dokku,gianpaj/dokku,eleventigers/dokku,jamesmarva/dokku,jazzzz/dokku,mehulsbhatt/dokku-alt,gianpaj/dokku,Cactusbone/dokku,sseemayer/dokku,beni55/dokku,arsthanea/dokku,sseemayer/dokku,vfulco/dokku-alt,Evlos/dokku,rocLv/dokku,vijayviji/dokku,mehulsbhatt/dokku-alt,fruitl00p/dokku,matto1990/dokku,AnselZhangGit/dokku,emdantrim/dokku,alessio/dokku,dokku/dokku,Git-Host/dokku,stnly/dokku-alt,Fab-IT-ApS/dokku,emdantrim/dokku,mrluc/dokku,ebeigarts/dokku,biddyweb/dokku,vkurup/dokku,omeid/dokku,omeid/dokku,dokku/dokku,vkurup/dokku,beedesk/dokku-alt,beedesk/dokku,Evlos/dokku,barseghyanartur/dokku,davidsiefert/dokku,jimeh/dokku,beni55/dokku,ignlg/dokku,vfulco/dokku-alt,claytonbrown/dokku,stnly/dokku-alt,gabrielrios/dokku,callahad/dokku,jazzzz/dokku,tilgovi/dokku,dokku-alt/dokku-alt,cjblomqvist/dokku,ignlg/dokku,fmoliveira/dokku,F4-Group/dokku,stnly/dokku-alt,progrium/dokku,gabrielrios/dokku,mouserage/dokku,fruitl00p/dokku,ertrzyiks/dokku,stepri/dokku,matto1990/dokku,stenius/dokku,arthurschreiber/dokku,vfulco/dokku-alt,vijayviji/dokku,akatrevorjay/dokku,henrik/dokku,AnselZhangGit/dokku,fkowal/dokku,bogdal/dokku,stepri/dokku,frog/dokku,stepri/dokku,pmvieira/dokku,jimeh/dokku,hanwoody/dokku,arsthanea/dokku,elia/dokku,alessio/dokku,vkurup/dokku,nnnnathann/dokku,henrik/dokku,vlipco/dokku,jamesblunt/dokku,mehulsbhatt/dokku-alt,crisward/dokku,tilgovi/dokku,codeconfab/dokku,zimbatm/dokku,vijayviji/dokku,gabrielrios/dokku,davidsiefert/dokku,kennetham/dokku,crisward/dokku,henrik/dokku,econya/dokku,stenius/dokku,eleventigers/dokku,netbrick/dokku-alt,progrium/dokku,u2mejc/dokku,ayufan/dokku,mlebkowski/dokku,fkowal/dokku,hbouvier/dokku,lmars/dokku,mmerickel/dokku,vlipco/dokku,netbrick/dokku-alt,arthurschreiber/dokku,bogdal/dokku,beni55/dokku,rocLv/dokku,progrium/dokku,fmoliveira/dokku,mmerickel/dokku,progrium/dokku,fmoliveira/dokku,vfulco/dokku-alt,jazzzz/dokku,fruitl00p/dokku,leonardodino/dokku,callahad/dokku,arsthanea/dokku,sebastianscatularo/dokku,aydintd/dokku,stnly/dokku-alt,omeid/dokku,eleventigers/dokku,econya/dokku,experimental-platform/dokku,klodoo/dokku,nnnnathann/dokku,alexquick/dokku,gianpaj/dokku,bobvanderlinden/dokku,jazzzz/dokku,gabrielrios/dokku,jimeh/dokku,kennetham/dokku,beedesk/dokku,dokku/dokku,crisward/dokku,bobvanderlinden/dokku,Fab-IT-ApS/dokku,fkowal/dokku,kennetham/dokku,ddreaml/dokku,bkniffler/dokku,experimental-platform/dokku,vijayviji/dokku,vlipco/dokku,johnfraney/dokku,eljojo/dokku,netbrick/dokku-alt,claytonbrown/dokku,mmerickel/dokku,biddyweb/dokku,suxor42/dokku,mrluc/dokku,stenius/dokku,Git-Host/dokku,Fab-IT-ApS/dokku,expa/dokku,jamesblunt/dokku,rocLv/dokku,tilgovi/dokku,jamesblunt/dokku,kennetham/dokku,bewest/dokku-alt,Git-Host/dokku,alessio/dokku,ebeigarts/dokku,experimental-platform/dokku,arthurschreiber/dokku,nnnnathann/dokku,alexquick/dokku,klodoo/dokku,sseemayer/dokku,ertrzyiks/dokku,alexquick/dokku,jamesblunt/dokku,Evlos/dokku,dokku-alt/dokku-alt,dsrowell/dokku-alt,fmoliveira/dokku,beedesk/dokku,jamesmarva/dokku,basicer/dokku,codeconfab/dokku,Fab-IT-ApS/dokku,callahad/dokku,beedesk/dokku-alt,emdantrim/dokku,barseghyanartur/dokku,matto1990/dokku,beedesk/dokku,netbrick/dokku-alt,gabrielrios/dokku,alessio/dokku,mmerickel/dokku,TribeMedia/dokku,henrik/dokku,eljojo/dokku,biddyweb/dokku,alexquick/dokku,mehulsbhatt/dokku-alt,pmvieira/dokku,mouserage/dokku,bobvanderlinden/dokku,leonardodino/dokku,AnselZhangGit/dokku,mrluc/dokku,fmoliveira/dokku,lmars/dokku,stnly/dokku-alt,akatrevorjay/dokku,Evlos/dokku,akatrevorjay/dokku,codeconfab/dokku,emdantrim/dokku,eljojo/dokku,mouserage/dokku,sebastianscatularo/dokku,beedesk/dokku-alt,hanwoody/dokku,rocLv/dokku,jazzzz/dokku,ertrzyiks/dokku,hanwoody/dokku,arthurschreiber/dokku,jamesmarva/dokku,klodoo/dokku,claytonbrown/dokku,amaltson/dokku,stenius/dokku,jamesmarva/dokku,vkurup/dokku,vkurup/dokku,elia/dokku,u2mejc/dokku,suxor42/dokku,mrluc/dokku,experimental-platform/dokku,tilgovi/dokku,biddyweb/dokku,jimeh/dokku,eleventigers/dokku,sseemayer/dokku,bewest/dokku-alt,kennetham/dokku,davidsiefert/dokku,cjblomqvist/dokku,jimjag/dokku,dokku/dokku,omeid/dokku,frog/dokku,henrik/dokku,omeid/dokku,TribeMedia/dokku,sseemayer/dokku,dokku/dokku,mouserage/dokku,ebeigarts/dokku,zimbatm/dokku,jazzzz/dokku,stepri/dokku,mlebkowski/dokku,vijayviji/dokku,sseemayer/dokku,ignlg/dokku,zimbatm/dokku,rocLv/dokku,eleventigers/dokku,jimjag/dokku,beni55/dokku,progrium/dokku,expa/dokku,tilgovi/dokku,mlebkowski/dokku,johnfraney/dokku,nnnnathann/dokku,barseghyanartur/dokku,experimental-platform/dokku,ayufan/dokku,3onyc/dokku,nnnnathann/dokku,mrluc/dokku,leonardodino/dokku,klodoo/dokku,sebastianscatularo/dokku,netbrick/dokku,experimental-platform/dokku,mlebkowski/dokku,basicer/dokku,barseghyanartur/dokku,bobvanderlinden/dokku,jamesmarva/dokku,arthurschreiber/dokku,suxor42/dokku,AnselZhangGit/dokku,arthurschreiber/dokku,TribeMedia/dokku,codeconfab/dokku,netbrick/dokku,stenius/dokku,bogdal/dokku,bkniffler/dokku,bobvanderlinden/dokku,tilgovi/dokku,dokku-alt/dokku-alt,basicer/dokku,u2mejc/dokku,ayufan/dokku,fmoliveira/dokku,emdantrim/dokku,Fab-IT-ApS/dokku,bkniffler/dokku,sseemayer/dokku,vlipco/dokku,sebastianscatularo/dokku,rocLv/dokku,ddreaml/dokku,suxor42/dokku,pmvieira/dokku,beedesk/dokku-alt,mehulsbhatt/dokku-alt,alessio/dokku,fkowal/dokku,eljojo/dokku,gianpaj/dokku,stnly/dokku-alt,Fab-IT-ApS/dokku,u2mejc/dokku,akatrevorjay/dokku,suxor42/dokku,eljojo/dokku,netbrick/dokku-alt,Cactusbone/dokku,pmvieira/dokku,ddreaml/dokku,cjblomqvist/dokku,eljojo/dokku,zimbatm/dokku,ayufan/dokku,bogdal/dokku,codeconfab/dokku,mouserage/dokku,leonardodino/dokku,crisward/dokku,emdantrim/dokku,basicer/dokku,dokku-alt/dokku-alt,arsthanea/dokku,eljojo/dokku,lmars/dokku,cjblomqvist/dokku,beni55/dokku,jimeh/dokku,jimjag/dokku,arsthanea/dokku,bkniffler/dokku,jazzzz/dokku,arthurschreiber/dokku,dokku/dokku,pmvieira/dokku,nnnnathann/dokku,mlebkowski/dokku,dsrowell/dokku-alt,TribeMedia/dokku,frog/dokku,vlipco/dokku,dsrowell/dokku-alt,econya/dokku,netbrick/dokku,mmerickel/dokku,klodoo/dokku,beedesk/dokku-alt,econya/dokku,mehulsbhatt/dokku-alt,frog/dokku,netbrick/dokku-alt,ebeigarts/dokku,Git-Host/dokku,TribeMedia/dokku,lmars/dokku,alessio/dokku,AnselZhangGit/dokku,klodoo/dokku,bogdal/dokku,bewest/dokku-alt,stepri/dokku,claytonbrown/dokku,Cactusbone/dokku,matto1990/dokku,fmoliveira/dokku,claytonbrown/dokku,ignlg/dokku,beedesk/dokku-alt,biddyweb/dokku,lmars/dokku,crisward/dokku,eljojo/dokku,expa/dokku,claytonbrown/dokku,mmerickel/dokku,hanwoody/dokku,jimeh/dokku,beni55/dokku,stepri/dokku,jimjag/dokku,biddyweb/dokku,sebastianscatularo/dokku,dsrowell/dokku-alt,TribeMedia/dokku,ignlg/dokku,fkowal/dokku,hanwoody/dokku,econya/dokku,dokku/dokku,barseghyanartur/dokku,akatrevorjay/dokku,akatrevorjay/dokku,bobvanderlinden/dokku,beedesk/dokku,amaltson/dokku,hbouvier/dokku,bewest/dokku-alt,arsthanea/dokku,alexquick/dokku,codeconfab/dokku,rocLv/dokku,basicer/dokku,dokku-alt/dokku-alt,hanwoody/dokku,Evlos/dokku,bkniffler/dokku,AnselZhangGit/dokku,zimbatm/dokku,rocLv/dokku,expa/dokku,beni55/dokku,bogdal/dokku,amaltson/dokku,crisward/dokku,callahad/dokku,Git-Host/dokku,3onyc/dokku,gianpaj/dokku,econya/dokku,mehulsbhatt/dokku-alt,mrluc/dokku,lmars/dokku,Cactusbone/dokku,johnfraney/dokku,Evlos/dokku,beedesk/dokku-alt,vlipco/dokku,vfulco/dokku-alt,ddreaml/dokku,dokku-alt/dokku-alt,ertrzyiks/dokku,codeconfab/dokku,hbouvier/dokku,jimjag/dokku,amaltson/dokku,ignlg/dokku,fruitl00p/dokku,Git-Host/dokku,beedesk/dokku,dsrowell/dokku-alt,vfulco/dokku-alt,expa/dokku,vijayviji/dokku,TribeMedia/dokku,alexquick/dokku,johnfraney/dokku,dsrowell/dokku-alt,suxor42/dokku,arsthanea/dokku,tilgovi/dokku,vijayviji/dokku,stnly/dokku-alt,mrluc/dokku,johnfraney/dokku,u2mejc/dokku,ddreaml/dokku,alexquick/dokku,jimeh/dokku,bewest/dokku-alt,vlipco/dokku,suxor42/dokku,henrik/dokku,hbouvier/dokku,leonardodino/dokku,netbrick/dokku,aydintd/dokku,cjblomqvist/dokku,AnselZhangGit/dokku,frog/dokku,aydintd/dokku,johnfraney/dokku,fkowal/dokku,ertrzyiks/dokku,johnfraney/dokku,jamesmarva/dokku,akatrevorjay/dokku,matto1990/dokku,vlipco/dokku,stenius/dokku,pmvieira/dokku,elia/dokku,frog/dokku,lmars/dokku,ayufan/dokku,bobvanderlinden/dokku,omeid/dokku,vkurup/dokku,netbrick/dokku,F4-Group/dokku,hbouvier/dokku,eleventigers/dokku,ayufan/dokku,stnly/dokku-alt,pmvieira/dokku,gabrielrios/dokku,jamesblunt/dokku,biddyweb/dokku,claytonbrown/dokku,sebastianscatularo/dokku,elia/dokku,3onyc/dokku,gianpaj/dokku,arthurschreiber/dokku,elia/dokku,TribeMedia/dokku,Fab-IT-ApS/dokku,sebastianscatularo/dokku,vkurup/dokku,bewest/dokku-alt,beedesk/dokku-alt,mouserage/dokku,Cactusbone/dokku,experimental-platform/dokku,matto1990/dokku,basicer/dokku,arsthanea/dokku,mouserage/dokku,beedesk/dokku,Cactusbone/dokku,Evlos/dokku,aydintd/dokku,dsrowell/dokku-alt,mouserage/dokku,klodoo/dokku,stepri/dokku,3onyc/dokku,F4-Group/dokku,ertrzyiks/dokku,ebeigarts/dokku,econya/dokku,jamesblunt/dokku,expa/dokku,klodoo/dokku,aydintd/dokku,bkniffler/dokku,zimbatm/dokku,jimjag/dokku,amaltson/dokku,netbrick/dokku-alt,jamesmarva/dokku,3onyc/dokku,3onyc/dokku,bogdal/dokku,cjblomqvist/dokku,cjblomqvist/dokku,stenius/dokku,hanwoody/dokku,sseemayer/dokku,mmerickel/dokku,mlebkowski/dokku,jazzzz/dokku,expa/dokku,mehulsbhatt/dokku-alt,bkniffler/dokku,progrium/dokku,dokku-alt/dokku-alt,vijayviji/dokku,vfulco/dokku-alt,ddreaml/dokku,stepri/dokku,dsrowell/dokku-alt,leonardodino/dokku,paralin/crew,tilgovi/dokku,F4-Group/dokku,alexquick/dokku,u2mejc/dokku,beedesk/dokku,aydintd/dokku,dokku-alt/dokku-alt,gabrielrios/dokku,kennetham/dokku,mmerickel/dokku,bewest/dokku-alt,davidsiefert/dokku,kennetham/dokku,netbrick/dokku,F4-Group/dokku,F4-Group/dokku,bkniffler/dokku,fruitl00p/dokku,Cactusbone/dokku,jamesmarva/dokku,matto1990/dokku,ertrzyiks/dokku,fruitl00p/dokku,gianpaj/dokku,Evlos/dokku,alessio/dokku,amaltson/dokku,aydintd/dokku,callahad/dokku,netbrick/dokku,pmvieira/dokku,netbrick/dokku,ddreaml/dokku,vkurup/dokku,emdantrim/dokku,claytonbrown/dokku,jimjag/dokku,davidsiefert/dokku,paralin/crew,nnnnathann/dokku,zimbatm/dokku,bewest/dokku-alt,elia/dokku,3onyc/dokku,F4-Group/dokku,omeid/dokku,elia/dokku,omeid/dokku,alessio/dokku,basicer/dokku,ebeigarts/dokku,henrik/dokku,lmars/dokku,davidsiefert/dokku,codeconfab/dokku,ebeigarts/dokku,jimjag/dokku,fruitl00p/dokku,u2mejc/dokku,davidsiefert/dokku,experimental-platform/dokku,gabrielrios/dokku,amaltson/dokku,callahad/dokku,ddreaml/dokku,ertrzyiks/dokku,netbrick/dokku-alt,fkowal/dokku,AnselZhangGit/dokku,fmoliveira/dokku,3onyc/dokku,crisward/dokku,fruitl00p/dokku,hanwoody/dokku,akatrevorjay/dokku,Git-Host/dokku,callahad/dokku,dokku/dokku,davidsiefert/dokku,henrik/dokku,amaltson/dokku,leonardodino/dokku,barseghyanartur/dokku,johnfraney/dokku,ayufan/dokku,beni55/dokku,basicer/dokku,biddyweb/dokku,vfulco/dokku-alt,cjblomqvist/dokku,progrium/dokku,progrium/dokku,kennetham/dokku,Fab-IT-ApS/dokku,mlebkowski/dokku,ebeigarts/dokku,emdantrim/dokku,barseghyanartur/dokku,eleventigers/dokku,matto1990/dokku,u2mejc/dokku,hbouvier/dokku,jamesblunt/dokku,F4-Group/dokku