{"id":9049,"library":"iregexp-check","title":"iregexp-check","description":"iregexp-check is a Python library providing bindings to a Rust crate for working with I-Regexp, an interoperable regular expression format. It allows Python developers to validate and interact with I-Regexp patterns. The library is actively maintained with regular updates and is currently at version 0.1.4.","status":"active","version":"0.1.4","language":"en","source_language":"en","source_url":"https://github.com/jg-rp/rust-iregexp/tree/main/crates/python","tags":["regex","regular expressions","validation","iregexp","rust-bindings"],"install":[{"cmd":"pip install iregexp-check","lang":"bash","label":"Install latest version"}],"dependencies":[{"reason":"Required Python interpreter version.","package":"python","optional":false,"min_version":"3.8"}],"imports":[{"note":"The primary function for validating I-Regexp patterns.","symbol":"is_valid_iregexp","correct":"from iregexp_check import is_valid_iregexp"}],"quickstart":{"code":"from iregexp_check import is_valid_iregexp\n\n# Example 1: A valid I-Regexp pattern\npattern_valid = \"o.o|aa\"\nprint(f\"'{pattern_valid}' is valid: {is_valid_iregexp(pattern_valid)}\")\n\n# Example 2: An invalid I-Regexp pattern (e.g., unmatched parenthesis)\npattern_invalid = \"(abc\"\nprint(f\"'{pattern_invalid}' is valid: {is_valid_iregexp(pattern_invalid)}\")\n\n# Example 3: Another valid I-Regexp pattern\npattern_simple = \"foo\"\nprint(f\"'{pattern_simple}' is valid: {is_valid_iregexp(pattern_simple)}\")","lang":"python","description":"This quickstart demonstrates how to import and use the `is_valid_iregexp` function to check the validity of I-Regexp patterns. The function returns `True` for valid patterns and `False` for invalid ones."},"warnings":[{"fix":"Always refer to the I-Regexp specification or relevant documentation to ensure your patterns adhere to its specific syntax, rather than assuming compatibility with PCRE/Python `re`.","message":"I-Regexp (Interoperable Regular Expression Format) has a specific syntax which may differ from common regular expression engines like PCRE (Perl Compatible Regular Expressions) or Python's `re` module. Patterns valid in other regex engines might be invalid or behave differently in I-Regexp.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Change string literals for patterns from `\"\\s+\"` to `r\"\\s+\"`.","message":"When defining regular expression patterns in Python, especially those with backslashes, always use raw strings (prefix the string literal with 'r', e.g., `r'\\d+'`). This prevents Python's string literal processing from interpreting backslashes as escape sequences before the regular expression engine sees them, avoiding unexpected behavior or `SyntaxWarning`s.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-16T00:00:00.000Z","next_check":"2026-07-15T00:00:00.000Z","problems":[{"fix":"Ensure the package is installed: `pip install iregexp-check`.","cause":"The `iregexp-check` library is not installed in the current Python environment, or the environment is not correctly activated.","error":"ModuleNotFoundError: No module named 'iregexp_check'"},{"fix":"Ensure that the pattern passed to the function is always a string. For example, `is_valid_iregexp(\"foo\")` instead of `is_valid_iregexp(123)`.","cause":"The `is_valid_iregexp` function (or similar functions in the library) expects a string argument for the regular expression pattern, but a non-string type was provided.","error":"TypeError: argument 'pattern' must be str, not int"}]}