How to pass a variable within a regex expression

Question

Let's say I have the ff regex:

var str = 'hi there I am';

function testing(input, int){

  var par = input.match(`/.{1, ${int}}/g`);
  console.log(par);
}

console.log(testing(str, 5));

How can I passed in the argument/variable nto make it work on the regex?

Is there a way to do that?

score 1 · Answer 1 · answered Sep 08 '17 at 05:33

1

You can use template literals

function maxTotal(n){
  console.log(`/.{1,${n}}/g`);
  //var max = total.match(`/.{1,${n}}/g`);
}

maxTotal(4);

answered Sep 08 '17 at 05:33

Suren Srapyan

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It seems doesnt work on my end. is there any other way to do it? – Sep 08 '17 at 05:41
What browser do you use? You can see the links, which are duplicated to your question – Suren Srapyan Sep 08 '17 at 05:42
I am using Chrome – Sep 08 '17 at 05:42
Look at this here: https://jsbin.com/cabovugoyo/edit?html,js,console – Sep 08 '17 at 05:45
Your ES version of the bin is under 6, so this is the problem. For other cases see https://stackoverflow.com/questions/494035/how-do-you-use-a-variable-in-a-regular-expression – Suren Srapyan Sep 08 '17 at 05:54
can you tell me how – Sep 08 '17 at 06:10

How to pass a variable within a regex expression

1 Answers1