BUILDMID

Build a Regex Playground CLI

45 minutes

0 completed

nodecliregexinteractive

Description

Build an interactive terminal tool for testing and learning regular expressions with real-time highlighting.

Requirements

Interactive REPL: type a regex pattern and test string, see matches highlighted

Show all match groups, indices, and captured groups

Built-in cheat sheet accessible with /help

History of tested patterns (navigate with up/down arrows)

Support common regex flags (g, i, m, s)

Show "plain English" explanation of what the regex does

Use Node.js readline for the REPL interface. Highlight matches using ANSI color codes in the output.

Pattern library with common patterns (email, URL, phone, etc.)

Performance benchmark (time to match against large input)

Export matches as JSON

You will be guided through MCP setup before the timer starts