question: public static void validateSecurityGroupsFormat ( List < String > securityGroups ) throws InvalidSecurityGroupFormatException { if ( securityGroups != null ) { for ( String sg : securityGroups ) { if ( StringUtils . isBlank ( sg ) || sg . split ( "\\\\" ) . length != 2 ) { throw new InvalidSecurityGroupFormatException ( "The security group format should match domain\\group" ) ; } } } }
target:  Validate the security groups' format.