fix username escape in whois regex

bert.py

@@ -204,10 +204,9 @@ def is_registered(username):
    try:
       sendRaw("WHOIS "+str(username)+"\n")
       user_info = getMessage()
-      regex = r"330 "+str(nick)+" "+str(username)+" [a-zA-Z0-9]+ :is logged in as"
+      regex = r"330 "+str(re.escape(nick))+" "+str(re.escape(username))+" \S+ :is logged in as"
       matches = re.finditer(regex, user_info, re.MULTILINE)
       for match in matches:
-         print(match.group(0))
          acc_name = match.group(0).split()[3]
       return acc_name
    except Exception as err: