Patterns: Regular Expressions for grep
A regular expression describes the shape of the text you want instead of the exact words, so grep can find every phone number or every date in a file; this lesson builds patterns from . and [ ], ^ and $, * and, with grep -E, + and |.
Updated
![Cheat sheet for the lesson Patterns: Regular Expressions for grep: A regular expression describes the shape of the text you want instead of the exact words, so grep can find every phone number or every date in a file; this lesson builds patterns from . and [ ], ^ and $, * and, with grep -E, + and |.](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/11579d10c9bf4b4d8071d4ba8a6d2045.webp)
- Category
- Bash
- Level
- Journeyman
- Tags
- character-class, grep, linux, regular-expression-in-the-shell, unix