diff --git a/src/features/dfdElements/outputPortBehaviorValidation.ts b/src/features/dfdElements/outputPortBehaviorValidation.ts
index b2736e5..023b74d 100644
--- a/src/features/dfdElements/outputPortBehaviorValidation.ts
+++ b/src/features/dfdElements/outputPortBehaviorValidation.ts
@@ -23,13 +23,13 @@ export class PortBehaviorValidator {
     // Regex that validates a set statement.
     // Has the label type and label value that should be set as capturing groups.
     private static readonly SET_REGEX =
-        /^set +([A-Za-z][A-Za-z0-9_]*)\.([A-Za-z][A-Za-z0-9_]*) *= *(?: +|!|TRUE|FALSE|\|\||&&|\(|\)|[A-Za-z][A-Za-z0-9_]*(?:\.[A-Za-z][A-Za-z0-9_]*){2})+$/;
+        /^set +([A-Za-z][A-Za-z0-9_]*)\.([A-Za-z][A-Za-z0-9_]*) *= *(?: +|!|TRUE|FALSE|\|\||&&|\(|\)|[A-Za-z][A-Za-z0-9_\|]*(?:\.[A-Za-z][A-Za-z0-9_]*){2})+$/;
     // Regex that is used to extract all inputs, their label types and label values from a set statement.
     // Each input is a match with the input name, label type and label value as capturing groups.
     private static readonly SET_REGEX_EXPRESSION_INPUTS =
-        /([A-Za-z][A-Za-z0-9_]*)\.([A-Za-z][A-Za-z0-9_]*)\.([A-Za-z][A-Za-z0-9_]*)/g;
+        /([A-Za-z][A-Za-z0-9_\|]*)\.([A-Za-z][A-Za-z0-9_]*)\.([A-Za-z][A-Za-z0-9_]*)/g;
     // Regex matching alphanumeric characters.
-    public static readonly REGEX_ALPHANUMERIC = /[A-Za-z0-9_]+/;
+    public static readonly REGEX_ALPHANUMERIC = /[A-Za-z0-9_\|]+/;
 
     constructor(@inject(LabelTypeRegistry) @optional() private readonly labelTypeRegistry?: LabelTypeRegistry) {}
 
diff --git a/src/features/dfdElements/outputPortEditUi.ts b/src/features/dfdElements/outputPortEditUi.ts
index ee4c493..6d7a28e 100644
--- a/src/features/dfdElements/outputPortEditUi.ts
+++ b/src/features/dfdElements/outputPortEditUi.ts
@@ -103,7 +103,7 @@ const dfdBehaviorLanguageMonarchDefinition: monaco.languages.IMonarchLanguage =
         root: [
             // keywords and identifiers
             [
-                /[a-zA-Z_$][\w$]*/,
+                /[a-zA-Z_\|$][\w$]*/,
                 {
                     cases: {
                         "@keywords": "keyword",
diff --git a/src/features/dfdElements/ports.tsx b/src/features/dfdElements/ports.tsx
index a61e740..6d0f5e6 100644
--- a/src/features/dfdElements/ports.tsx
+++ b/src/features/dfdElements/ports.tsx
@@ -54,7 +54,7 @@ export class DfdInputPortImpl extends SPortImpl {
         if (edgeNames.length === 0) {
             return undefined;
         } else {
-            return edgeNames.sort().join("_");
+            return edgeNames.sort().join("|");
         }
     }