Intended Audience

This page describes who ansi-regex is designed for and what kinds of problems it solves. Understanding whether this library fits your use case will help you decide whether to integrate it into your project. ansi-regex is intended for developers who need to programmatically detect, match, or strip ANSI escape codes from strings — for example, when processing terminal output, sanitizing file content, or searching through text that may contain control sequences.

Who This Library Is For

ansi-regex is a fundamental tool for developers who work with text files, terminal output, or log data and need to search for, identify, or isolate ANSI escape sequences within that content. If your application reads from the command line, processes colored terminal output, or handles files that may embed control characters, this library gives you a reliable regular expression to work with.

You are the right audience for this library if you:

• Write Node.js applications or scripts that process terminal output programmatically.
• Need to strip or detect ANSI color/style codes from strings before displaying, storing, or comparing them.
• Work with file content or file names that may contain ANSI escape sequences and need to search through them using wildcard or pattern-based logic.
• Are building tooling such as CLI frameworks, log processors, or text renderers that must remain agnostic to embedded control characters.

What Level of Experience Is Assumed

This library assumes you are comfortable with JavaScript and Node.js module patterns. You should understand how to import a module, call a function, and use the resulting RegExp object against a string. You do not need deep expertise in regular expressions — the library generates the pattern for you — but familiarity with String.prototype.match(), RegExp.prototype.test(), and related methods will help you get the most out of it.

What This Library Is Not For

ansi-regex is a library, not a standalone command-line tool. It does not execute searches on its own. Instead, it provides a building block — a pre-constructed regular expression — that you incorporate into your own application logic. If you are looking for a ready-made CLI utility to grep files, you will need to combine this library with your own file-reading and matching code.

Checking whether ansi-regex fits your use case

The snippet below shows the core pattern this library exposes. Calling the exported function returns a RegExp object ready to use with any string containing potential ANSI escape sequences.

'use strict';
const ansiRegex = require('ansi-regex');

const regex = ansiRegex();

const sample = '\u001B[4mUnderlined text\u001B[0m';
console.log(regex.test(sample));

Expected output:

true

If your workflow involves strings like sample — text that arrives from a terminal, a log file, or a CLI tool — then ansi-regex is the right fit. The function constructs a global regular expression (g flag included) so you can also use it with String.prototype.match() to retrieve every escape sequence present in a given string.

• Generating the regex — How to call ansiRegex() and configure it for your matching needs.
• Matching and testing strings — Using the returned RegExp with test(), match(), and replace() to act on ANSI sequences.
• Installation — How to add ansi-regex to your project dependencies.