Test, validate and match regular expressions
This regex matches the literal string 'site.com/fr' in a case-insensitive manner, so it also captures variations like 'Site.Com/FR' or 'SITE.com/Fr'. It is typically used to identify or filter French-language URLs, such as detecting locale paths for routing, access log analysis, or content targeting. The escaped dot and slash ensure exact literal character matching rather than regex special behavior.