Fix permalinks issue with repeated sections

Fixes #10377

resources/page/integration_test.go

@@ -136,3 +136,42 @@ Sort: [éclair emma xylophone zulu]
 ByWeight: alpha|émotion|zulu|
 `)
 }
+
+// See #10377
+func TestPermalinkExpansionSectionsRepeated(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ["home", "taxonomy", "taxonomyTerm", "sitemap"]
+[outputs]
+home = ["HTML"]
+page = ["HTML"]
+section = ["HTML"]
+[outputFormats]
+[permalinks]
+posts = '/:sections[1]/:sections[last]/:slug'
+-- content/posts/_index.md --
+-- content/posts/a/_index.md --
+-- content/posts/a/b/_index.md --
+-- content/posts/a/b/c/_index.md --
+-- content/posts/a/b/c/d.md --
+---
+title: "D"
+slug: "d"
+---
+D
+-- layouts/_default/single.html --
+RelPermalink: {{ .RelPermalink }}
+
+`
+
+	b := hugolib.NewIntegrationTestBuilder(
+		hugolib.IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		}).Build()
+
+	b.AssertFileContent("public/a/c/d/index.html", "RelPermalink: /a/c/d/")
+
+}

resources/page/permalinks.go

@@ -176,7 +176,7 @@ func (l PermalinkExpander) parse(patterns map[string]string) (map[string]func(Pa
 // can return a string to go in that position in the page (or an error)
 type pageToPermaAttribute func(Page, string) (string, error)
 
-var attributeRegexp = regexp.MustCompile(`:\w+(\[.+\])?`)
+var attributeRegexp = regexp.MustCompile(`:\w+(\[.+?\])?`)
 
 // validate determines if a PathPattern is well-formed
 func (l PermalinkExpander) validate(pp string) bool {

resources/page/permalinks_test.go

@@ -42,6 +42,7 @@ var testdataPermalinks = []struct {
 	{"/:2006_01_02_15_04_05.000", true, "/2012_04_06_03_01_59.000"}, // Complicated custom date format
 	{"/:sections/", true, "/a/b/c/"},                                // Sections
 	{"/:sections[last]/", true, "/c/"},                              // Sections
+	{"/:sections[0]/:sections[last]/", true, "/a/c/"},               // Sections
 
 	// Failures
 	{"/blog/:fred", false, ""},