let string = '##header1\ntext line\n##header2\n';

​

function make_html() {

  print(string); //_________________________________ show input

  let m = splitTokens(string, '\n'); //___________ make array of lines / erase all \n

  for (let i = 0; i < m.length; i++) {

    if (m[i].indexOf('##') >= 0)  m[i] = '<h2>'+m[i].substring(2,m[i].length)+'</h2>';  //_________________________ overwrite with new html header syntax

  }

  let news = join(m, '<br>'); //____________________ html lines from array

  print(news); //___________________________________ show output html

}

​

function setup() {

  make_html();

}