public static final synchronized String environmentSubstitute( String aString,
    Map<String, String> systemProperties ) {
    return environmentSubstitute( aString, systemProperties, false );
  }
@Test
  public void environmentSubstituteHexEscapeTest() {
    String result = StringUtil.environmentSubstitute( "$[31,32,33,34,35,36]", createVariables1( "${", "}" ), true );
    assertEquals( "$[31,32,33,34,35,36]", result );
  }