03. Survey Parser js exam

function solve(args) {
  const surveyRegex = /<svg>((.|\n)*?)<\/svg>/g;
  const format = /<cat><text>((.|\n)*)\[((.|\n)*)]((.|\n)*)<\/text><\/cat>\s*<cat>((.|\n)*)<\/cat>/g;
  const valuesRegex = /\s*<g><val>([0-9]+)<\/val>([0-9]+)<\/g>/g;
  let matches = surveyRegex.exec(args);
  const validMatches = [];
  let survey = '';
  let values = '';

  if (matches) {
    while (matches) {
      const match = matches[1];
      const isValid = format.exec(match);
      if (isValid) {
        validMatches.push(match);
        survey = isValid[3];
        values = isValid[7];
      }
      matches = surveyRegex.exec(args);
    }

    if (validMatches.length > 0) {
      let sum = 0;
      let votes = 0;
      let valuesMatches = valuesRegex.exec(values);
      while (valuesMatches) {
        const value = Number(valuesMatches[1]);
        const count = Number(valuesMatches[2]);
        if (value > 0 && value <= 10) {
          sum += value * count;
          votes += count;
          valuesMatches = valuesRegex.exec(values);
        }
      }

      let average = parseFloat((sum / votes).toFixed(2));
      if (votes === 0) {
        average = 0;
      }
      console.log(`${survey}: ${average}`);
    } else {
      console.log('Invalid format');
    }
  } else {
    console.log('No survey found');
  }
}