---
title: Rewrite blog archive URLs
image: https://developers.cloudflare.com/core-services-preview.png
---

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# Rewrite blog archive URLs

Create a transform rule to rewrite the URL format `/posts/<YYYY>-<MM>-<DD>-<TITLE>` to the new format `/posts/<YYYY>/<MM>/<DD>/<TITLE>`.

To rewrite the URLs of a blog archive that follow the URL format `/posts/<YYYY>-<MM>-<DD>-<TITLE>` to the new format `/posts/<YYYY>/<MM>/<DD>/<TITLE>`, create the following URL rewrite rule:

Text in **Expression Editor**:

```
http.request.uri.path ~ "^/posts/[0-9]+-[0-9]+-[0-9]+-.*"
```

Text after **Path** \> **Rewrite to** \> _Dynamic_:

```
regex_replace(http.request.uri.path, "^/posts/([0-9]+)-([0-9]+)-([0-9]+)-(.*)$", "/posts/${1}/${2}/${3}/${4}")
```

The function `regex_replace()` also allows you to extract parts of the URL using regular expressions' capture groups. Create capture groups by putting part of the regular expression in parentheses. Then, reference a capture group using `${<NUMBER>}` in the replacement string, where `<NUMBER>` is the number of the capture group.

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```