docs: public static TregexPattern safeCompile(String tregex, boolean verbose) {
      TregexPattern result = null;
      try {
        result = TregexPatternCompiler.defaultCompiler.compile(tregex);
      } catch (TregexParseException ex) {
        if (verbose) {
          System.err.println("Could not parse " + tregex + ":");
          ex.printStackTrace();
        }
      }
      return result;
    }