What is Regex Tester?
Regex Tester is a free AI-powered computer science tool that helps you get the answer faster than doing it by hand. Built into Backrow's Computer Science engine, it's designed for CS students, bootcamp grads, and self-taught developers who want a faster way to finish their work in less time.
Common uses
- Last-minute computer science homework
- Checking your work before turning it in
- For data validation assignments or web scraping projects
How to use Regex Tester
- 1
Open Regex Tester
Go to backrow.ai/free/regex-tester — free to try with the credits a new account starts with.
- 2
Paste your input
Drop in your content. Enter your regex pattern and test string...
- 3
Get your result instantly
Backrow processes the input and returns the worked output — usually in under 5 seconds.
- 4
Copy, save, or refine
Copy the result to your clipboard, save it to your Backrow workspace for later, or tweak the input and re-run.
Regex Tester vs other tools
vs Stack Overflow
Backrow gives you a working answer instantly instead of waiting hours for a community reply (or being marked duplicate).
vs GitHub Copilot
Backrow doesn't require a paid subscription and works in your browser — no IDE setup needed.
vs ChatGPT
Backrow is purpose-built for regex tester — no prompt engineering, no hallucinated steps, no "as a large language model" preamble.
Frequently asked questions
Do I need an account to use Regex Tester?+
Yes — Regex Tester calls an AI model, so it needs a free account. Signing up takes a minute, needs no card, and starts you with 200 credits. 14 of Backrow's calculators do run with no account at all; they are listed at backrow.ai/free.
Is Regex Tester actually free?+
Yes — Regex Tester is covered by the welcome gift. Every new Backrow account starts with 200 credits, one time, and Regex Tester runs at zero credit cost. No card required to sign up.
How is this different from Stack Overflow?+
Stack Overflow is a great single-purpose tool. Backrow's Regex Tester is one of 120+ tools in a single platform — alongside lecture recording, AI notes, flashcards, quizzes, and study guides. You stop juggling five subscriptions and switching tabs.
Will my professor catch me using this?+
Regex Tester is a study aid, not a cheating tool. Use it the same way you'd use a calculator, dictionary, or office hours: to understand the work, not to dodge it. For assignments where AI is explicitly banned, don't use it. For everything else (problem sets, exam prep, learning a topic faster), it's fair game.
Do I need to download anything?+
No. Regex Tester runs in your browser. Works on Mac, Windows, Linux, iOS, and Android. There's also a mobile-installable version (PWA) at backrow.ai if you want it on your home screen.
What other computer science tools does Backrow have?+
Backrow's Computer Science engine includes everything from problem solvers to regex tools. See the full Computer Science catalog at backrow.ai/free or browse all 120 tools at backrow.ai/free.
Can I use Regex Tester on my phone?+
Yes — Regex Tester works in any modern mobile browser (Safari on iOS, Chrome on Android). The interface is touch-optimized for small screens.
Related tools
Free: the AI Study Toolkit
4 printable templates: a spaced repetition schedule, a lecture to flashcards workflow, a 7 day finals plan, and a one page cram sheet.