# \#regex

**URL:** https://community.silverfin.com/tag/regex/435.md

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## [CASE: Input validation with Regular Expressions (Regex)](https://community.silverfin.com/t/case-input-validation-with-regular-expressions-regex/2617)

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**Author:** [@Delphine\_Demeulenaer](https://community.silverfin.com/u/Delphine_Demeulenaer)\
**Replies:** 0\
**Last updated:** [March 4, 2026, 8:39am UTC](https://community.silverfin.com/t/case-input-validation-with-regular-expressions-regex/2617 "2026-03-04T08:39:29Z")

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While standard attributes like min or max are great for numbers, sometimes you need to validate specific formats like Tax IDs, IBANs, or custom reference codes. This is where Regular Expressions (Regex) come in. By usin…