Codecrafters Grep for JavaScript is a powerful command-line utility built with Node.js that mimics the functionality of the traditional grep tool. This utility is designed to search for text patterns within files or standard input, supporting a subset of regular expression syntax. It includes features such as recursive directory searching, allowing users to efficiently locate text patterns across multiple files and directories.

Key Features

• Pattern Matching: Implements a custom engine for a subset of Extended Regular Expression (ERE) syntax, including operators like ., ?, +, and character classes.

• Line Anchoring: Supports anchoring patterns to the beginning or end of a line using ^ and $ respectively.

• Recursive Search: The -r flag enables searching through directories and their subdirectories.

• Standard Input: Reads from stdin if no file or directory paths are provided.

• Standard Exit Codes: Exits with code 0 if at least one match is found, and 1 if no matches are found.

This tool is ideal for developers and system administrators who need a lightweight and flexible solution for text searching and pattern matching in JavaScript environments.