wro4j-maven-plugin/src/main/java/ro/isdc/wro/maven/plugin/AbstractWro4jMojo.java
private boolean isTargetGroup(final Group group) {
    notNull(group);
    final String targetGroups = getTargetGroups();
    // null, means all groups are target groups
    return targetGroups == null || targetGroups.contains(group.getName());
  }
private boolean isTargetGroup(final Group group) {
    notNull(group);
    final String targetGroups = getTargetGroups();
    // null, means all groups are target groups
    return targetGroups == null || targetGroups.contains(group.getName());
  }
Check if the provided group is a target group.