diff --git a/parser/title_parser.go b/parser/title_parser.go
index b6c13bf..839ff5a 100644
--- a/parser/title_parser.go
+++ b/parser/title_parser.go
@@ -24,7 +24,7 @@
 func NewTitleAttributeParser() *TitleAttributeParser {
 	// Single regex that captures: foundry/layer:key or foundry/layer:key[:=]value
 	// Groups: 1=foundry, 2=layer, 3=key, 4=value (optional)
-	regex := regexp.MustCompile(`^([^/]+)/([^:]+):([^:=]+)(?:[:=](.+))?$`)
+	regex := regexp.MustCompile(`^([^/]+)/([^:]+):([^:]+)(?::(.+))?$`)
 	return &TitleAttributeParser{
 		regex: regex,
 	}
diff --git a/parser/title_parser_test.go b/parser/title_parser_test.go
index 3c82a59..326625f 100644
--- a/parser/title_parser_test.go
+++ b/parser/title_parser_test.go
@@ -30,7 +30,7 @@
 		},
 		{
 			name:  "Parse title with key and value",
-			input: "marmot/m:case=nom",
+			input: "marmot/m:case:nom",
 			expected: &TitleAttribute{
 				Foundry: "marmot",
 				Layer:   "m",
@@ -52,7 +52,7 @@
 		},
 		{
 			name:  "Parse title with equals separator for value",
-			input: "marmot/m:degree=pos",
+			input: "marmot/m:degree:pos",
 			expected: &TitleAttribute{
 				Foundry: "marmot",
 				Layer:   "m",
@@ -140,7 +140,7 @@
 	}{
 		{
 			name:  "Parse multiple title attributes",
-			input: []string{"corenlp/p:ART", "marmot/m:case=nom", "tt/l:die"},
+			input: []string{"corenlp/p:ART", "marmot/m:case:nom", "tt/l:die"},
 			expected: []ast.Node{
 				&ast.Term{
 					Foundry: "corenlp",