# Ban 	"regexp" package and external libraries

**URL:** <https://forum.codecrafters.io/t/ban-regexp-package-and-external-libraries/1319>\
**Category:** Challenges\
**Tags:** challenge:grep\
**Created:** [August 7, 2024, 10:10am UTC](https://forum.codecrafters.io/t/ban-regexp-package-and-external-libraries/1319 "2024-08-07T10:10:41Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![rohitpaulk](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/rohitpaulk/32/6_2.png) [@rohitpaulk](https://forum.codecrafters.io/u/rohitpaulk)\
**Post date:** [October 5, 2024, 2:28pm UTC](https://forum.codecrafters.io/t/ban-regexp-package-and-external-libraries/1319/12 "2024-10-05T14:28:46Z")

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Just adding context here - we’ve added extra checks to prevent using regexp libraries! We haven’t removed the old code examples yet, but we have a feature in the works to re-run tests on older code examples and highlight ones that no longer pass tests.

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_[View the full topic](https://forum.codecrafters.io/t/ban-regexp-package-and-external-libraries/1319)._