fix: frontmatter delimiter regex swapped start-ending character

parser/frontmatter.go

@@ -54,7 +54,7 @@ func ParseKeyValueLine(line string) (string, string, error) {
 // delimiterRegex denotes the regex for a line that matches on when the
 // FrontMatter section is delimited from the rest of the content.
 // It must be a minimum of 3 dashes (-), and no other content.
-var delimiterRegex = regexp.MustCompile("$-{3,}^")
+var delimiterRegex = regexp.MustCompile("^-{3,}$")
 
 // ExtractFrontMatter will take an entire MarkDown file, and return a map that
 // contains key-value pairs. The key-value pairs must end with an extra line

parser/frontmatter_test.go

@@ -87,6 +87,13 @@ func TestExtractFrontMatterWithValidContent(t *testing.T) {
 		"parsing empty input yields unexpected result",
 	)
 
+	fm, e = parser.ExtractFrontMatter([]string{"# Content", "..."})
+	asrt.EqualValues(
+		extractResult{map[string]string{}, nil},
+		extractResult{fm, e},
+		"parsing empty input yields unexpected result",
+	)
+
 	fm, e = parser.ExtractFrontMatter([]string{"Key: Value", "---"})
 	asrt.EqualValues(
 		extractResult{map[string]string{"Key": "Value"}, nil},
@@ -133,11 +140,11 @@ func TestExtractFrontMatterWithBadKeys(t *testing.T) {
 		"parsing invalid FrontMatter with blank key yields invalid result",
 	)
 
-	fm, e = parser.ExtractFrontMatter([]string{"Key: Value", "Key: Dupe Value"})
+	fm, e = parser.ExtractFrontMatter([]string{"Key: Value", "Key: Dupe Value", "---"})
 	asrt.EqualValues(
 		extractResult{map[string]string{"Key": "Value"}, fmt.Errorf("error on parsing line 2: %w", parser.ErrDuplicateKey)},
 		extractResult{fm, e},
-		"parsing invalid FrontMatter with no final dashes yields invalid result",
+		"parsing invalid FrontMatter with duplicate key entry yields invalid result",
 	)
 
 	fm, e = parser.ExtractFrontMatter([]string{"Key: Value", "Another Key: Another Value"})