Fixing 'Range out of order in character class' error in JavaScript

If you're working with regular expressions in JavaScript, you may encounter an error message that reads "Range out of order in character class". This error occurs when the range of characters in a character class is not in the correct order.

├Źndice
  1. What is a character class?
  2. Why does the error occur?
  3. How to fix the error?

What is a character class?

A character class is a set of characters that are treated as a single unit. They are enclosed in square brackets and any character within the brackets is considered a match.

Why does the error occur?

The error message occurs when the range of characters in a character class is not in the correct order. For example, [z-a] is not a valid range because z comes after a in the ASCII character set. The correct range would be [a-z].

How to fix the error?

To fix the "Range out of order in character class" error, you need to ensure that the range of characters in your character class is in the correct order. You can do this by rearranging the order of the characters in the range. For example, [z-a] can be changed to [a-z].


// Incorrect range
const regex = /[z-a]/;

// Correct range
const regex = /[a-z]/;

Another way to fix this error is to escape the hyphen character with a backslash (). This tells the regular expression engine to treat it as a literal hyphen character rather than a range character.


// Escaping the hyphen
const regex = /[-z]/;

By following these tips, you should be able to fix the "Range out of order in character class" error in your JavaScript code.

Click to rate this post!
[Total: 0 Average: 0]

Related posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Go up

Below we inform you of the use we make of the data we collect while browsing our pages. You can change your preferences at any time by accessing the link to the Privacy Area that you will find at the bottom of our main page. More Information