Template format to format values like ${value[0:2]}

strTempalte.js

/**
 * Formats a URI using a context and a given RexExp
 * The default format is {value[0:20]} and the [0:2] is optional and represent a value.slice(0,2)
 * @param {string} URI The URI to be replace
 * @param {object} context The given context to work the lookup. e.g: {value: 'MY VALUE TO REPLACE'}
 * @param {RegExp} The regex to find the ocurrences on the URI
 */
function formatCustomURI(URI, context, reg) {

    URI = URI || '[0:2]\n\n{val[0:2]} \n{valor[0:2]}\n\nlucas\n${}\n$[]';
    reg = reg || /\{(.*?)\}/gi;

    let m,
        val,
        sliceRequired,
        startValue,
        lastValue,
        valueToReplace,
        mapObj = {};

    let matches = URI.match(reg).forEach(function(m){
    
        val = m.replace('{', '').replace('}', ''); //value inside {}
        //console.log(val);
        
        sliceRequired = val.indexOf(']') > -1;
        if(sliceRequired) {
            let initialParam = val.indexOf('['),
                lastParam = val.indexOf(']');

            startValue = val.slice(initialParam + 1, val.indexOf(':'));
            lastValue = val.slice(val.indexOf(':') + 1, lastParam);
            val = val.slice(0, initialParam);
        }

        valueToReplace = context[val];
        valueToReplace = sliceRequired && valueToReplace ? valueToReplace.slice(startValue, lastValue) : valueToReplace;
        mapObj[val] = valueToReplace;

        URI = valueToReplace ? URI.replace(m, valueToReplace) : URI;
    });

    //console.log(mapObj);
    return URI;
};

var fomartedUrl = formatCustomURI(
  'http://www4.tjmg.jus.br/juridico/sf/proc_resultado.jsp?tipoPesquisa=1&comrCodigo={id_basico[16:19]}&txtProcesso={id_basico}&listaProcessos={id_basico}&cpfcnpj=&tipoPessoa=X&naturezaProcesso=0&situacaoParte=X&codigoOAB=&tipoOAB=N&ufOAB=MG&tipoConsulta=1&natureza=0&ativoBaixado=X&numero=1&select=1', 
  { id_basico: '9333162303003844424' }
);

console.log(fomartedUrl);