Allow simple utilities with numbers in Oxide (#15110)

Fixes #15072

---------

Co-authored-by: Philipp Spiess <hello@philippspiess.com>

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ensure `space-x/y-*` and `divide-x/y-*` with variants can undo `space-x/y-reverse` and `divide-x/y-reverse` ([#15094](https://github.com/tailwindlabs/tailwindcss/pull/15094))
 - Don't print minified code when the build fails in the CLI ([#15106](https://github.com/tailwindlabs/tailwindcss/pull/15106))
 - Generate the correct CSS for the `break-keep` utility ([#15108](https://github.com/tailwindlabs/tailwindcss/pull/15108))
+- Pick up utilities with numbers when scanning files ([#15110](https://github.com/tailwindlabs/tailwindcss/pull/15110))
 - _Upgrade (experimental)_: Always add `layer(…)` as the first param to `@import` ([#15102](https://github.com/tailwindlabs/tailwindcss/pull/15102))
 
 ### Changed

crates/oxide/src/parser.rs

@@ -255,7 +255,7 @@ impl<'a> Extractor<'a> {
         if candidate.iter().all(|c| c.is_ascii_alphanumeric())
             && candidate
                 .iter()
-                .any(|c| c.is_ascii_uppercase() || c.is_ascii_digit())
+                .any(|c| c.is_ascii_uppercase())
         {
             return ValidationResult::Invalid;
         }
@@ -263,7 +263,7 @@ impl<'a> Extractor<'a> {
         // Reject candidates that look like SVG path data, e.g.: `m32.368 m7.5`
         if !candidate.contains(&b'-')
             && !candidate.contains(&b':')
-            && candidate.iter().any(|c| c == &b'.' || c.is_ascii_digit())
+            && candidate.iter().any(|c| c == &b'.')
         {
             return ValidationResult::Invalid;
         }
@@ -1539,4 +1539,21 @@ mod test {
             ]
         );
     }
+
+    #[test]
+    fn simple_utility_names_with_numbers_work() {
+        let candidates = run(
+            r#"<div class="h2 hz"></div>"#,
+            false,
+        );
+        assert_eq!(
+            candidates,
+            vec![
+                "div",
+                "class",
+                "h2",
+                "hz",
+            ]
+        );
+    }
 }