Using template literal inside of a regex

JavaScript
1

Tell us what’s happening:
May be I am going about this the wrong way, I am trying to use a regex to search for the target string at the end of the string. I attempted to use the target as a changeable variable. Only it is not working as intended.
Your code so far


function confirmEnding(str, target) {

let myRegex = /`${target}`$/
let result = myRegex.test(str)

return result;
}

confirmEnding("Bastian", "n");














  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36.

Challenge: Confirm the Ending

Link to the challenge:

2

Remember that regex is not a string. You can convert a string to regex, as explained here.

3

Here is a discussion on stackoverflow about this issue How do you use a variable in a regular expression?

But by far the easiest way to solve this is by using something like String.prototype.lastIndexOf();

4

a user can use a Template literal inside of a regular expression.

5

Yes, you can. A template literal resolves to a string. You can convert strings to regex. You build your string (with a template literal if you want) and then convert it to regex with the method shown in the links above.

6

Thanks for your help. Wanted to share my script for future refrence.
Spoiler Below

  const a = target
  const regex2 = new RegExp(`${a}$`,)
  let result = regex2.test(str)
  
  
  
  console.log(regex2)



  return result;
}

confirmEnding("Bastian", "n");
7

Cool. Yeah, that’s what I was thinking. I’d only add that the comma probably isn’t needed there:

RegExp(`${a}`,)
1 Like
8

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