> For the complete documentation index, see [llms.txt](https://blog.syselement.com/tcm/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://blog.syselement.com/tcm/courses/linux-101/9-regex.md).

# 9. Regular Expressions

### Topics

* What's a regular expression
* Usage and building of regular expressions

### Sections

1. [Regular Expressions, Searching, Replacing, Building](/tcm/courses/linux-101/9-regex/regex-use.md)