fix regexp (and tests)

Author: tebeka

proxy.go

@@ -50,7 +50,7 @@ go get gopkg.in/yaml.v3
 
 // gopkg.in/yaml.v3 _ https://github.com/go-yaml/yaml/tree/v3.0.1{/dir} https://github.com/go-yaml/yaml/blob/v3.0.1{/dir}/{file}#L{line} -> https://github.com/go-yaml/yaml
 // golang.org/x/term -> go.googlesource.com/term -> https://github.com/golang/go
-var ghRE = regexp.MustCompile(`https://(github\.com/[^/]+/[^/{}]+)`)  // Use github\.com to match literal dot, [^/{}]+ to stop at /, {, or }
+var ghRE = regexp.MustCompile(`https://(github\.com/[^\s/{}]+/[^\s/{}]+)`)  // Use github\.com to match literal dot, [^\s/{}]+ to stop at whitespace, /, {, or }
 var goGooglesourceRE = regexp.MustCompile(`https://go\.googlesource\.com/(\w+)`)
 
 // parseProxyHTML finds github repo in proxy HTML.