NamedVariablePatternMatcher throws an IllegalArgumentException when named variable is not the last part of the sequence

import org.junit.Test;

import com.opensymphony.xwork2.util.NamedVariablePatternMatcher;

public class NamedVariablePatternMatcherTest {

    @Test
    public void test() {
        new NamedVariablePatternMatcher().compilePattern("/{first}/two/{third}");
        new NamedVariablePatternMatcher().compilePattern("/first/two/{third}");
        new NamedVariablePatternMatcher().compilePattern("/first/{two}/{third}");
        new NamedVariablePatternMatcher().compilePattern("/{first}/{two}/third"); // java.lang.IllegalArgumentException: Missing openning '{' in [/ {first}/{two}/third]!         
        new NamedVariablePatternMatcher().compilePattern("/{first}/two"); //java.lang.IllegalArgumentException: Missing openning '{' in [/{first}
/two]!     }
}