find files by regular expression
/** if pattern is null or empty string, dirOnly will set to true by default */
function findFiles(startNode, pattern, ignoreCase=false, recursive=true, dirOnly=false)
npm install find-files-by-regular
const findfiles = require('find-files-by-regular');
let fileNamePattern = /.js$/;
let startFolder='.';
let files = findfiles(startFolder, fileNamePattern);
console.log(files);