python-style-regex-in-javascript.js

/*
  I stumbled upon the Python-syntax for creating a RegEx, and decided to spend a minute trying to replicate
  it in JavaScript with Template String Functions. I certainly have no use for it but there you go.
*/

function combine(...args) {
  const parts = args.shift();
  const inserts = [...args, ''];
  
  return parts.reduce((a, b, i) => (a += b + inserts[i]), '')
}

function r(...args) {
  return new RegExp(combine(...args));
}

// Example:
const regex = r`[0-9]+`;
console.log(regex.test('69')); // true

// Bonus snippet: no bytes wasted [81b]

let r=(...a)=>new RegExp(a.shift().reduce((b,c,i)=>b+c+(a.length<=i?'':a[i]),''))