public static boolean isScript(Object obj) {
    if (obj instanceof String string) {
      var matcher = EXPRESSION_PATTERN.matcher(string);
      return matcher.matches();
    }
    return false;
  }
Returns true if this is a string expression like {@code "${ ... }"}
planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/expression/ConfigExpressionScript.java