AddServerActivity: Fixed username regex - allow "-" in nicknames

src/org/yaaic/activity/AddServerActivity.java

@@ -332,7 +332,7 @@ private void validateIdentity() throws ValidationException
 		// <special>    ::= '-' | '[' | ']' | '\' | '`' | '^' | '{' | '}'
 		// Chars that are not in RFC 1459 but are supported too:
 		// | and _ 
-		Pattern nickPattern = Pattern.compile("^[a-zA-Z][a-zA-Z0-9^-`\\[\\]{}|_\\\\]*$");
+		Pattern nickPattern = Pattern.compile("^[a-zA-Z][a-zA-Z0-9^\\-`\\[\\]{}|_\\\\]*$");
 		if (!nickPattern.matcher(nickname).matches()) {
 			throw new ValidationException("Invalid nickname");
 		}