Get all JS functions which declarated as objects from string using single regex

parseJsFunctionsAsObjectFromString.js

/*
Return array, which contains match arrays
Groups:
  [0] - whole function 
  [1] - function name
  [2] - function signature (function(){} or ()=>{})
  [3] - function parameters (if declarated as function())
  [4] - function parameters (if declarated as ()=>)
  [5] - function body (without brackets)
Or use named groups (?<groupName>...) if ES2018
*/

const definedJsFunctionsAsObjectRegex = /^(?:const|let|var)\s*([A-z0-9]+)?\s*=\s(function\s*\(([^)(]+|\((?:[^)(]+|\([^)(]*\))*\))*\)|\(([^)(]+|\((?:[^)(]+|\([^)(]*\))*\))*\)\s*\=\>)\s*\{((?:[^}{]+|\{[^}{]*\}|[^}]|\}(\"|\'|\`))*)*\}/gm

const str = `
let f = function(a,b) {
  console.log(gdhfsgdfg);
}

const f2 = (a,b,   d) => { blabla }

let f3 = function(){
  fdgdhgf
}

function test() {
	const inner = (t, b) => { im must be undetected}
	const inner2 = function (a,b) {
		im must be undetected too
	}
}

// here checking for }"
function(fds) { obj = {} return "}" }

function r () { obj = {}; a = []; }

function a(){console.log('a')} function b(){console.log('b')}
`;

let matches = [...str.matchAll(definedJsFunctionsAsObjectRegex)];
console.log(matches)