in mask/matchers.go [51:65]
func compileRegexpFromStrings(paramNames []string) *regexp.Regexp {
var buffer bytes.Buffer
buffer.WriteString("(?i)")
for i, v := range paramNames {
if i > 0 {
buffer.WriteString("|")
}
buffer.WriteString(v)
}
return regexp.MustCompile(buffer.String())
}