> For the complete documentation index, see [llms.txt](https://docs.bottalk.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bottalk.io/docs/features/dictionaries/regular-expressions.md). # Regular Expressions Our dictionary also supports Regular Expressions (RegEx) for replacements, allowing you to define flexible and powerful patterns to match and modify text. With RegEx, you can target specific formats, such as numbers (`\d+`), words (`\w+`), or any sequence of characters (`.*`), making text manipulation more efficient and versatile. {% hint style="info" %} Our dictionary recognizes RegEx only when it is enclosed between `/` and `/`. Otherwise, it is interpreted as a regular word. {% endhint %}