# Regular Expressions — Debug Patterns Offline

> Debug Patterns Offline (iPhone/iPad app by Tsuyoshi Sezaki.)

- Source: https://appshunter.io/ios/app/regular-expressions/id6774077827 (this page in markdown: same URL + `.md`)
- Developer: [Tsuyoshi Sezaki](https://appshunter.io/developer/1886356149)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 38 MB
- Languages: American English
- Released: 2026-06-03
- Data updated: 2026-06-13
- User reviews in markdown: https://appshunter.io/ios/app/regular-expressions/id6774077827/reviews.md

## What is Regular Expressions?

Regular Expressions is an independent study app for building practical pattern-matching skill through focused questions and review.

Use it if you are learning from scratch, preparing for technical interviews, reviewing syntax, or strengthening day-to-day text processing skills.

- 160 questions across Fundamentals, Practical Skills, Common Pitfalls, and Advanced Concepts
- FSRS spaced-repetition intervals to review at the right time
- Weak-point heatmap to spot topics that need more work
- Daily challenge for consistent practice
- Mock exams for timed review
- Every question includes an explanation
- Offline practice, no login required

Topics cover matching, character classes, quantifiers, anchors, groups, alternation, escaping, lookarounds, greedy behavior, backtracking, and common mistakes.

Independent study app for Regular Expressions practice. Not affiliated with, endorsed by, or sponsored by any company, certification body, exam operator, or vendor. All trademarks belong to their respective owners.

Privacy: Practice offline, no login required.


## Version history (last 1 release)

### 1.0 — 2026-06-03

No release notes.

## More apps by Tsuyoshi Sezaki

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- [運転免許 合格ドリル](https://appshunter.io/ios/app/id6761160841)

All apps by Tsuyoshi Sezaki: https://appshunter.io/developer/1886356149

## Related topics

[regular expressions](https://appshunter.io/ios/topics/regular-expressions)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-13.*