RegexAssistant
RegexAssistant is a free, open-source Windows desktop tool for creating and testing regular expressions.
What RegexAssistant is
RegexAssistant is a free, open-source Windows desktop tool for creating and testing regular expressions. Its interface updates results while you type, showing when an expression works and when it stops working. It can display results for Boost, Scintilla, POSIX, STD Regex, Perl, and SED implementations. A token reference explains tokens and provides examples and matches; double-clicking a token inserts it into the expression. The reference also includes common patterns for phone numbers, IP addresses, dates, URLs, credit cards, and GUIDs. Regex replacement works with Boost or STD compatibility, and the Undo button can reverse a replacement. The tool can convert Windows file-system and SQL wildcard expressions into regex expressions. The project README links to downloadable release binaries, and the releases page lists version v1.0.0.5. The repository identifies the software as GPL-3.0 licensed and provides an Issues section for reporting or discussing problems. Building it requires Visual Studio 2017 or 2019, Boost, and Scintilla; Boost and Scintilla are not included in the repository.
Good
- Results update as you type.
- Displays results for six regex implementations.
- Token reference includes examples and sample matches.
- Supports replacement and undo.
- Converts Windows and SQL wildcards to regex.
Watch out
- Available for Windows only.
- Building requires Visual Studio 2017 or 2019.
- Boost and Scintilla are not included in the repository.
Who it suits
RegexAssistant suits Windows users who want to create, test, and replace text using regular expressions. It may also help developers checking behavior across the listed regex implementations.
Verdict
RegexAssistant pairs live expression feedback with a token reference, multiple compatibility options, and replacement tools. It is a Windows-only option, and building from source requires dependencies not included in the repository.
The facts
Each one read from RegexAssistant's own pages, with the date it was checked.
What it does
- Build requirements
- The project can be built with Visual Studio 2017 or 2019 and requires Boost and Scintilla, which are not included in the repository.checked 9 Oct 2026
- Cheat sheet
- Its token list provides token descriptions, example usage, and matches, and double-clicking a token inserts it into the expression.checked 4 Oct 2026
- Common patterns
- The token list includes patterns for phone numbers, IP addresses, dates, URLs, filenames, and other common formats.checked 9 Oct 2026
- Download
- The project README links to downloadable release binaries, and the releases page lists version v1.0.0.5.checked 4 Oct 2026
- Latest release
- The release page lists version v1.0.0.5 and describes added compatibility options and regex search-and-replace behavior.checked 9 Oct 2026
- License
- The repository identifies the project as licensed under GPL-3.0.checked 9 Oct 2026
- Live results
- The interface displays results in real time as expressions are entered.checked 9 Oct 2026
- Purpose
- RegexAssistant is an open-source regular-expression find-and-replace tool for Windows.checked 9 Oct 2026
- Regex compatibility
- The compatibility selector lists Boost, Scintilla, POSIX, STD Regex, Perl, and SED.checked 9 Oct 2026
- Release author
- The listed v1.0.0.5 release was published by David-Maisonave.checked 4 Oct 2026
- Replace
- Regex replacement is supported with Boost or STD compatibility, and results can be undone with the Undo button.checked 9 Oct 2026
- Support channel
- The repository has an Issues section for reporting or discussing project issues.checked 4 Oct 2026
- Token reference
- A cheat-sheet lists regex tokens with descriptions, examples, and example matches; double-clicking a token inserts it into the expression.checked 9 Oct 2026
- Wildcard conversion
- The tool converts Windows file-system and SQL wildcard expressions into regex expressions.checked 9 Oct 2026
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