Issue #10: fix — include underscore characters in the test for domains.

Author: StevenBlack

ghosts

@@ -112,7 +112,7 @@ func (h *Hosts) process() []string {
 
 	// step: line match regex for ip address, domain, or host
 	// This regex matches domain, or host
-	r, _ := regexp.Compile("((^(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]$)|((^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(\\s+((?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]\\s*)+$)))")
+	r, _ := regexp.Compile("((^(?:[a-z_0-9](?:[a-z_0-9-]{0,61}[a-z_0-9])?\\.)+[a-z_0-9][a-z_0-9-]{0,61}[a-z_0-9]$)|((^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(\\s+((?:[a-z_0-9](?:[a-z_0-9-]{0,61}[a-z_0-9])?\\.)+[a-z_0-9][a-z_0-9-]{0,61}[a-z_0-9]\\s*)+$)))")
 	var matchSlice []string
 	for i := range slc {
 		if r.MatchString(slc[i]) {