Username regexp is too strict
Username regexp is too strict

Username can contains more characters that the regexp allows. For example, on a raspberry pi, the default user for web server is 'www-data'.
superboum/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS,plopoyop/FreshRSS,romibi/FreshRSS,samuelstein/FreshRSS,marienfressinaud/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,Dolomich/FreshRSS,samuelstein/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,asmundg/FreshRSS,Dolomich/FreshRSS,Dolomich/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,asmundg/FreshRSS,superboum/FreshRSS,samuelstein/FreshRSS,asmundg/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,plopoyop/FreshRSS,superboum/FreshRSS,romibi/FreshRSS