How to add "\x" after every 2 words on a string in Javascript?

Question

I want to add "\x" after every 2 characters on a string, and also in the beginning. For example, the string 596d396962334a76 would become \x59\x6d\x39\x69\x62\x33\x4a\x76.

I tried this code: "596d396962334a76".match(new RegExp('.{1,2}', 'g')).join("/"); but it gives this error: Uncaught SyntaxError: Invalid hexadecimal escape sequence.

That is bacause you tried `.join("\x")`, right? You need two backslashes, `.join("\\x")` — Wiktor Stribiżew, Feb 15 '21 at 21:38
You state `add "\x" after every 2 characters`, but your example shows that you want to prefix `\x` to every 2 chars. Which is it? — Peter Thoeny, Feb 15 '21 at 21:46
**Wrong Dupe:** How is replacement of backward slash with forward slash same as adding `\x` every 2 words? — anubhava, Apr 12 '21 at 06:10

score 4 · Accepted Answer · answered Feb 15 '21 at 21:40

Instead of .match you can use .replace:

var s = '596d396962334a76';

var r = s.replace(/../g, '\\x$&');

console.log(r);

RegEx Demo

Here we match any 2 characters using /../g regex and append \x before each match by using replacement expression: \\x$&.

How to add "\x" after every 2 words on a string in Javascript?

1 Answers1