message: Update helper.ts for RasMol
diff: @@ -31,7 +31,7 @@ export function prefix(opParser: P.MonadicParser<any>, nextParser: P.MonadicPars
  export function prefixRemoveKet(opParser: P.MonadicParser<any>, nextParser: P.MonadicParser<any>, mapFn: any) {
  const parser: P.MonadicParser<any> = P.MonadicParser.lazy(() => {
  - return P.MonadicParser.seq(opParser, parser.skip(P.MonadicParser.string(')')))
  + return P.MonadicParser.seq(opParser, parser.skip(P.MonadicParser.regexp(/\)/)))
  .map(x => mapFn(...x))
  .or(nextParser);
  });
  