Detect utilities when containing capital letters followed by numbers (#19465)

Fixes #19463

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Do not wrap `color-mix` in a `@supports` rule if one already exists ([#19450](https://github.com/tailwindlabs/tailwindcss/pull/19450))
 - Allow whitespace around `@source inline()` argument ([#19461](https://github.com/tailwindlabs/tailwindcss/pull/19461))
 - CLI: Emit comment when source maps are saved to files ([#19447](https://github.com/tailwindlabs/tailwindcss/pull/19447))
+- Detect utilities when containing capital letters followed by numbers ([#19465](https://github.com/tailwindlabs/tailwindcss/pull/19465))
 
 ### Added
 

crates/oxide/src/extractor/named_utility_machine.rs

@@ -284,6 +284,7 @@ impl Machine for NamedUtilityMachine<ParsingState> {
                             | Class::Dot
                             | Class::Number
                             | Class::AlphaLower
+                            | Class::AlphaUpper
                     ) {
                         return self.restart();
                     }
@@ -425,6 +426,8 @@ mod tests {
             // With number followed by dash or underscore
             ("text-title1-strong", vec!["text-title1-strong"]),
             ("text-title1_strong", vec!["text-title1_strong"]),
+            // With capital letter followed by number
+            ("text-titleV1-strong", vec!["text-titleV1-strong"]),
             // With trailing % sign
             ("from-15%", vec!["from-15%"]),
             // Arbitrary value with bracket notation