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Regular Expressions / Regular Expressions Anchors

Hey there! We're thoughtbot, a design and development consultancy that brings your digital product ideas to life. We also love to share what we learn.

This coding exercise comes from Upcase, the online learning platform we run. It's part of the Regular Expressions course and is just one small sample of all the great material available on Upcase, so be sure to visit and check out the rest.

Exercise Intro

Anchors in regular expressions are a powerful tool that allows you to be much more precise in what you match. Instead of matching "a" anywhere in a string, you can match "a" at the start or end of a string.

For more, check out the documentation.


To start, you'll want to clone and run the setup script for the repo

git clone
cd regular-expressions-anchors

First, run bin/setup.

Then, run rake to see the failing tests. You can run rake at any point to see the test results again.

Fill in the methods in lib/anchors.rb to make the tests pass.

Featured Solution

Check out the featured solution branch to see the approach we recommend for this exercise.

Forum Discussion

If you find yourself stuck, be sure to check out the associated Upcase Forum discussion for this exercise to see what other folks have said.

Next Steps

When you've finished the exercise, head on back to the Regular Expressions course to find the next exercise, or explore any of the other great content on Upcase.


regular-expressions-anchors is Copyright © 2015-2018 thoughtbot, inc. It is free software, and may be redistributed under the terms specified in the LICENSE file.



This exercise is maintained and funded by thoughtbot, inc.

The names and logos for Upcase and thoughtbot are registered trademarks of thoughtbot, inc.

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