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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/regexp/TestRegexp.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/regexp/TestRegexp.java
new file mode 100644
index 000000000..ad2b1661d
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/regexp/TestRegexp.java
@@ -0,0 +1,20 @@
+package org.simantics.scl.compiler.parser.regexp;
+
+import org.simantics.scl.compiler.parser.regexp.automata.DFA;
+
+
+public class TestRegexp {
+
+    public static void main(String[] args) {
+        
+        Regexp exp = Regexp.of("a*b|ac*");
+        
+        System.out.println(exp);
+        DFA aut = exp.toAutomaton().determinize().minimize();
+        System.out.println(aut.toRegexp());
+        
+        //AutomatonVisualizer.show(aut);
+        
+    }
+    
+}