Allow spaces in example references

CHANGELOG.md

@@ -6,6 +6,20 @@ All user visible changes to `cucumber` crate will be documented in this file. Th
 
 
 
+## main
+
+[Diff](https://github.com/cucumber-rs/cucumber/compare/v0.22.0...main) | [Milestone](https://github.com/cucumber-rs/cucumber/milestone/31)
+
+### Fixed
+
+- Incorrectly disallowed spaces inside placeholders for `Examples`. ([#388], [#387])
+
+[#387]: https://github.com/cucumber-rs/cucumber/issues/387
+[#388]: https://github.com/cucumber-rs/cucumber/pull/388
+
+
+
+
 ## [0.22.0] · 2025-12-12
 [0.22.0]: https://github.com/cucumber-rs/cucumber/tree/v0.22.0
 

src/feature.rs

@@ -142,12 +142,18 @@ fn expand_scenario(
 ) -> Vec<Result<gherkin::Scenario, ExpandExamplesError>> {
     /// [`Regex`] matching placeholders [`Examples`] should expand into.
     ///
+    /// # Format
+    ///
+    /// - Spaces are allowed inside placeholder.
+    /// - Placeholder cannot start or end with a space.
+    ///
     /// [`Examples`]: gherkin::Examples
     // TODO: Switch back to `lazy-regex::regex!()` once it migrates to `std`:
     //       https://github.com/Canop/lazy-regex/issues/10
     #[expect(clippy::unwrap_used, reason = "regex is valid")]
-    static TEMPLATE_REGEX: LazyLock<Regex> =
-        LazyLock::new(|| Regex::new(r"<([^>\s]+)>").unwrap());
+    static TEMPLATE_REGEX: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(r"<([^>\s](?:[^>\s]?|[^>\t\n\r\v\f]*[^>\s]))>").unwrap()
+    });
 
     if scenario.examples.is_empty() {
         return vec![Ok(scenario)];

tests/features/output/background_scenario_outline.feature

@@ -6,8 +6,8 @@ Feature: Outline
   Scenario Outline: foo
     Given foo is <bar1>
     When foo is <bar2>
-    Then foo is <bar3>
+    Then foo is <bar 3>
 
     Examples:
-      | bar1 | bar2 | bar3 |
-      | 1    |  2   |  3   |
+      | bar1 | bar2 | bar 3 |
+      | 1    |  2   |   3   |

tests/features/output/scenario_outline_with_spaces_in_headers.feature

@@ -0,0 +1,10 @@
+Feature: Outline
+
+  Scenario Outline: foo
+    Given foo is <bar 1>
+    When foo is <bar two>
+    Then foo is <bar three>
+
+    Examples:
+      | bar 1 | bar two | bar three |
+      |   0   |    1    |     2     |

tests/features/output/scenario_outline_with_spaces_in_headers.feature.basic.out

@@ -0,0 +1,5 @@
+Feature: Outline
+  Scenario Outline: foo
+   ✔  Given foo is 0
+   ✔  When foo is 1
+   ✔  Then foo is 2

tests/features/output/scenario_outline_with_spaces_in_headers.feature.colored.out

@@ -0,0 +1,8 @@
+Feature: Outline
+  Scenario Outline: foo
+      Given foo is 0
+   ✔  Given foo is 0
+      When foo is 1
+   ✔  When foo is 1
+      Then foo is 2
+   ✔  Then foo is 2