get all tags from a text (javascript), '#dfgdgf fgsdfg fgfgfgfg #gg' to ['#dfgdgf', '#gg'].

get_tags.js

function get_tags(text) { //{{{
  console.time('algs tags time');

  const tags = [];
  const txt = text.trim().split('');
  let reg_tag = false;
  let cur_tag = '';

  for (let i = 0; i < txt.length; i++) {
    if (reg_tag && txt[i] === '#') {
      tags.push(cur_tag);
      cur_tag = '';
    };

    if (!reg_tag && txt[i] === '#') {
      reg_tag = true;
    };

    if (reg_tag && txt[i] === ' ') {
      if (cur_tag !== '#') {
        tags.push(cur_tag);
      }
      reg_tag = false;
      cur_tag = '';
      continue;
    };

    if (reg_tag) {
      cur_tag = cur_tag + txt[i];
    };
  };
  tags.push(cur_tag);

  console.timeEnd('algs tags time');
  return tags;
} //}}}

function get_regular_tags(text) { //{{{
  console.time("regular time");
  const regex = /\#(\w+)/g;
  const tags = [];
  let m;
  while (m = regex.exec(text)) {
    tags.push(m[1]);
  }
  console.timeEnd("regular time");
  return tags;
} //}}}

const t1_txt = '#cg#dfg fgfg# #dfdf'; //{{{
const t2_txt = '#cg#dfg # dsdfg 32gf #dsfa df s# dsgf sfdg fsg dfdfdfdf # dfgfsadgfdsg #dsfagsadfg # dsagasgfg #dfasfdasdfdsfasdgfafgafsdg#### sa#dfsdf#fgfg# #dfd ## sadfg G#dsgf ##$DFASDGfscgvsagsdfg#@#$$## fdsgfgasd### #RSDFAWDSF#43334##EFDFGSadf 34$## dasdgfasdfg#DFdfsgasdfdf#adgf'; //}}}

console.log(t1_txt);
console.log(get_tags(t1_txt));

console.assert(get_tags(t1_txt).length === get_regular_tags(t1_txt).length, 'bad len');

console.log(get_tags(t2_txt).length);
console.log(get_regular_tags(t2_txt).length);
console.assert(get_tags(t2_txt).length === get_regular_tags(t2_txt).length, 'bad len');