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The Regex Coach
What it is
The Regex Coach is a free graphical application for experimenting with Perl-compatible regular expressions. It indicates whether a pattern matches a target string and updates the interface when changes are made. Users can highlight captured groups or selected parts of a pattern in the target text. The application can describe a regex in plain English, display its parse tree graphically and step through the matching process. It also simulates Perl split and substitution operations. Written in Common Lisp, it uses CL-PPCRE as its regex engine. The current Windows download is version 0.9.2, and the maker says the program has not changed since 2008. Linux is no longer maintained, though an unsupported 0.8.5 release is available and also runs on FreeBSD. There is no Mac version planned. The maker supplies the program as-is without warranty and does not promise support for older Windows configurations or the unsupported Linux release. The regex engine may encounter a stack overflow with relatively long expressions; the maker also notes possible issues on some Eastern European Windows versions using character set 1250 or similar.
For and against
For
- Shows matches as patterns change
- Highlights captured groups in target text
- Explains patterns and displays parse trees
- Steps through matching and simulates split and substitution
Against
- Linux release is unsupported and no longer maintained
- No Mac version is planned
- Program has not changed since 2008
- Long expressions may cause a stack overflow
The verdict
The Regex Coach provides interactive tools for exploring Perl-compatible expressions, including matching inspection and a step-through view. Its Windows release is old, and Linux support is explicitly unsupported.
Who it suits
It may suit programmers using Perl-compatible regex toolkits such as PCRE or CL-PPCRE who want to inspect matching behavior interactively.
Plans and prices
The Regex Coach
Free for private and non-commercial use · Commercial use is free, but redistribution or charging money requires written permission
Read 2 Oct 2026 · weitz.de
On the record
- Engine and implementation
- The application is written in Common Lisp and uses CL-PPCRE as its regex engine.weitz.de · read 2 Oct 2026
- Intended users
- The maker says it may be useful to programmers using Perl-compatible regex toolkits such as PCRE or CL-PPCRE.weitz.de · read 2 Oct 2026
- Known limitations
- The regex engine may encounter a stack overflow on relatively long regular expressions, and the maker notes possible issues on Eastern European Windows versions using character set 1250 or similar.weitz.de · read 2 Oct 2026
- Linux availability
- Linux is no longer maintained, but the maker provides the unsupported 0.8.5 release, which also runs on FreeBSD.weitz.de · read 2 Oct 2026
- Live matching
- It shows whether a regex matches a target string and updates other parts of the application in real time when you make changes.weitz.de · read 2 Oct 2026
- Mac availability
- The maker says there is no Mac version and no plan to release one.weitz.de · read 2 Oct 2026
- Maker
- The site identifies Prof. Dr. Edmund Weitz as the maker and lists his address at HAW Hamburg in Hamburg, Germany.weitz.de · read 2 Oct 2026
- Matching stepper
- It can single-step through the matching process performed by its regex engine.weitz.de · read 2 Oct 2026
- Match inspection
- It can highlight captured groups or selected parts of a regular expression in the target string.weitz.de · read 2 Oct 2026
- Privacy and security
- The maker's website privacy notice says its server logs may include IP addresses and other access data, and that anonymous log data is stored separately from personal data supplied by users.weitz.de · read 2 Oct 2026
- Regex explanation
- It tries to describe a regular expression in plain English and can display a graphical representation of its parse tree.weitz.de · read 2 Oct 2026
- Support and warranty
- The program is provided as-is with no warranty, and the maker says not to expect support for older Windows configurations or the unsupported Linux release.weitz.de · read 2 Oct 2026
- Text operations
- It simulates Perl's split and substitution operators.weitz.de · read 2 Oct 2026
- What it does
- The Regex Coach is a graphical application for interactively experimenting with Perl-compatible regular expressions.weitz.de · read 2 Oct 2026
- Windows availability
- The current download is version 0.9.2, and the maker says the program has not changed since 2008; the page reports it worked for the maker on Windows 10 in June 2023.weitz.de · read 2 Oct 2026
