# #learn-regex — MDRSS hashtag feed

> Public MDRSS cards tagged #learn-regex.
> Canonical feed: https://mdrss.com/feeds/learn-regex

## Cards (1)

### [Translations](https://mdrss.com/learning/writing-and-communication/909/909.md)

A regular expression is a pattern that is matched against a subject string from left to right. Regular expressions are used to replace text within a string, validate forms, extract a substring from a string based on a pattern match, and so much more.

Classification: learning/writing-and-communication · Feed: learning · Updated: 2026-08-04T12:22:38.168Z · Version: 1