How to use Regular Expressions in the redirect module

Regular expressions (regex) are used to match and manipulate text based on patterns. In the context of URL redirection, they can match multiple URLs and extract information from the source URL to copy it to the target URL.

This is particularly useful when you want to redirect URLs that share a common pattern. For example, you can use regex to redirect all URLs that match a certain pattern to a new location. 

Here are some common examples how to use regex redirects in SiteManager:

1. Redirect all pages from an old directory to a new subdirectory:
   • Source: /old-dir/(.*)
   • Destination: https://example.com/new-dir/$1
   •  Example:
     • Old: https://example.com/articles/welcome-to-our-new-house
     • New: https://example.com/blog/welcome-to-our-new-house
2. Redirect a specific page to a new location:
   • Source: page1/?
   • Destination: https://example.com/page2/
   • Example:
     • Old: https://example.com/articles/
     • New: https://example.com/blog/
3. Redirect indexed pages of single language (NL) to multi language site (NL, FR & EN): 
   • Source: (?!nl(\/|$)|fr(\/|$)|en(\/|$))(.*)
     • page doesn't start with nl/, fr/ or en/
   • Destination: https://example.com/nl/$1
   • Example:
     • Old: https://example.com/over-ons/
     • New: https://example.com/nl/over-ons/