So I am trying to make a save file system thing, and it creates a file with your username, but when you log in it checks the user saves file to see if theres a file called "[username]_save.txt", but I'm not sure how to do it with a username variable. Could someone help me out? thanks!
use Regular expresseion
let regexp = new RegExp(username)
if (regexp.test(filename))
// true
Without additional code and examples of what you have so far it's a shot in the dark to help you, but here's a thought:
Use concatenation or template literal to incorporate the username into the filename you are looking for.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
If you have more info on the issue we can provide more help!