---
id: iregexp-check
version: "0.1.4"
license: unclear
license_treatment: permissive
maintenance: aging
---

# iregexp-check

License: permissive · Maintenance: aging · Downloads: 492.4K/mo

## What it is and what it does

iregexp_check is a Python binding to a Rust implementation that validates whether a regular expression conforms to RFC 9485 I-Regexp, a standardized regex format intended to be portable across different systems and programming languages. It provides a single function, `check()`, that takes a regex pattern string and returns True if the pattern is valid I-Regexp, False otherwise.

The package targets developers who need to ensure regex patterns will work consistently across interoperable systems or who are building tools that must enforce I-Regexp compliance. It has no runtime dependencies and is distributed as compiled wheels for most common platforms, though it carries medium install friction due to its compiled nature.

Use it for:

- Validate user-supplied regex patterns in web applications before storing or executing them against I-Regexp compliance rules.
- Enforce regex portability in code review or CI/CD pipelines by checking patterns conform to RFC 9485.
- Build regex linters or validation tools that need to reject non-portable regex syntax early.
- Test regex patterns intended for use in systems or languages that only support I-Regexp format.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Validates regular expressions against RFC 9485 I-Regexp, an interoperable regex format designed for portability across systems and languages.

Yes, if you need RFC 9485 I-Regexp validation and can tolerate aging maintenance. The package is permissively licensed, has no dependencies, and covers current Python versions. However, the 689-day gap since release and lack of recent commits suggest limited active development; verify that the package still meets your compliance needs before relying on it in production.

## Install

pip install iregexp-check
uv add iregexp-check
poetry add iregexp-check

## Installing iregexp-check

Before you install: Medium install friction due to compiled wheels; the package is aging (689 days since release, last commit 2025-08-24) with no active development signals, though the repository remains unarchived and the codebase supports current Python versions (3.8–3.13).

License in practice: Licensed under MIT (permissive), so you can use, modify, and distribute the package freely with minimal restrictions.

Quickstart:

pip install iregexp_check

from iregexp_check import check

print(check(r"[ab]{3}"))  # True
print(check(r"[0-9]*?"))  # False

Requires Python 3.8 or later; compiled wheels are provided for common platforms but may require a build step on unsupported architectures.

Verify before relying:

- Whether the package is actively maintained or if the 689-day gap since last release indicates abandonment.
- Real-world coverage of I-Regexp edge cases and how strictly it enforces RFC 9485 compliance.
- Performance characteristics when validating large or complex regex patterns.

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: medium
- Maintenance: aging
- Downloads: 492.4K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

RFC 9485 I-Regexp validation, interoperable regex format checker, regex compliance validator, I-Regexp format check, portable regex validation, regex portability testing, regex-validation, standards-compliance

[View on SkillFed](https://skillfed.io/packages/iregexp-check) · [View on PyPI](https://pypi.org/project/iregexp-check/)