code: function findInterpolation(string, startIndex) {
      const interpolationRegex = /#{(.*?)}/g;
      const results = [];
      // Searching for interpolation
      let match = interpolationRegex.exec(string);
  
      startIndex = !isNaN(startIndex) ? Number(startIndex) : 0;
      while (match !== null) {
        results.push({
          source: match[0],
          operators: findOperators({
            string: match[0],
            globalIndex: match.index + startIndex
          })
        });
        match = interpolationRegex.exec(string);
      }
  
      return results;
    }
docs: Takes a string, finds all occurencies of Sass interpolaion in it, then
  finds all operators inside that interpolation
  
  @return {array} An array of ojbects { string, operators } - effectively,
  a list of operators for each Sass interpolation occurence