Get Ids from usernames with discord.js

getIds.js

getIds = () => {
	const rsGuild = client.guilds.cache.get('<server-id>');

	rsGuild.members.fetch()
		.then(() => {
			const lineReader = require('readline').createInterface({
				input: require('fs').createReadStream('infile.txt')
			});

			lineReader.on('line', (line) => {
				try {
				console.log(rsGuild.members.cache.find(u => {
					return u.user.username === line.match(/[^#]*/g)[0] && u.user.discriminator === line.match(/\d\d\d\d$/g)[0];
				}).id);
				} catch (e) {
					console.log(line.match(/[^#]*/g)[0]);
				}
			});

		})
		.catch(console.error);
}