code-points-vs-regexps.js

'use strict';

const { writeFileSync } = require('fs');

const LAST_CODE_POINT = 0x10FFFF;
const RegExps = [/./u, /^(?!.)/, /\w/u, /\W/u, /\d/u, /\D/u, /\s/u, /\S/u, /\b/u, /\B/u];

let codePoint = 0;
let str;
let data = '';


while (codePoint <= LAST_CODE_POINT) {
  str = String.fromCodePoint(codePoint);
  data += `${codePoint} ${RegExps.filter(test).join(' ')}\n`;
  codePoint++;
}

writeFileSync(
  `code-points-vs-regexps.node.${process.versions.node}.V8.${process.versions.v8}.txt`,
  data);


function test(re) { return re.test(str); }