MatcherBuilder(TemplateScalarModel match) throws TemplateModelException 
{
            this.matchString = match.getAsString();
}

 public Object exec(List args) throws TemplateModelException 
{
            int numArgs = args.size();
            if (numArgs == 0) {
                throw new TemplateModelException("Expecting at least one argument");
            }
            if (numArgs  > 2) {
                throw new TemplateModelException("Expecting at most two argumnets");
            }
            String patternString = (String) args.get(0);
            String flagString = (numArgs  >1) ? (String) args.get(1) : "";
            Pattern pattern = getPattern(patternString, flagString);
            Matcher matcher = pattern.matcher(matchString);
            return new RegexMatchModel(matcher, matchString);
}