drools-eclipse/org.drools.eclipse/src/main/java/org/drools/eclipse/dsl/editor/DSLAdapter.java
static String findDSLConfigName(String content) {
        String name = null;
        Matcher matches = EXPANDER_PATTERN.matcher( content );
        if (matches.find()) {
            name = matches.group(1) + ".dsl";
        }
        return name;
    }
static String findDSLConfigName(String content) {
        String name = null;
        Matcher matches = EXPANDER_PATTERN.matcher( content );
        if (matches.find()) {
            name = matches.group(1) + ".dsl";
        }
        return name;
    }
Sniffs out the expander/DSL config name as best it can.