Fix regexp syntax error caused by variable names containing any characters except letters, digits, and underscores
Fix regexp syntax error caused by variable names containing any characters except letters, digits, and underscores

dvln/mux,Manbeardo/mux,studygolang/mux,pH14/mux,kiip/mux,TramPamPam/mux,outrightmental/go-mux,Gorilla/mux,Vorstack/mux,gorilla/mux,w4ngyi/mux,laohanlinux/mux,CedarLogic/mux,coolljt0725/mux