diff --git a/src/features/dfdElements/outputPortBehaviorValidation.ts b/src/features/dfdElements/outputPortBehaviorValidation.ts
index 46b5bc6..4769468 100644
--- a/src/features/dfdElements/outputPortBehaviorValidation.ts
+++ b/src/features/dfdElements/outputPortBehaviorValidation.ts
@@ -23,16 +23,15 @@ export class PortBehaviorValidator {
     // Regex that validates assignments
     // Matches "Assignment({input_Pins};Term;{out_Label})"
     private static readonly ASSIGNMENT_REGEX =
-        /^Assignment\(\{(([A-Za-z0-9_\|]+(,\s*[A-Za-z0-9_\|]+)*)?)\};(\s*|!|TRUE|FALSE|\|\||&&|\(|\)|([A-Za-z][A-Za-z0-9_]*\.[A-Za-z][A-Za-z0-9_]*))+;\{(((([A-Za-z][A-Za-z0-9_\|]*)\.([A-Za-z][A-Za-z0-9_\|]*))+(,\s*(([A-Za-z][A-Za-z0-9_\|]*)\.([A-Za-z][A-Za-z0-9_\|]*)))*)?)\}\)+$/;
+        /^Assignment\(\{(([A-Za-z0-9_\|]+(,\s*[A-Za-z0-9_\|]+)*)?)\};(\s*|!|TRUE|FALSE|\|\||&&|\(|\)|([A-Za-z0-9_]*\.[A-Za-z0-9_]*))+;\{(((([A-Za-z0-9_\|]*)\.[A-Za-z0-9_\|]*)+(,\s*([A-Za-z0-9_\|]*\.[A-Za-z0-9_\|]*))*)?)\}\)+$/;
 
     // Regex that validates forwarding
     // Matches "Forwarding({input_pins})"
     private static readonly FORWARDING_REGEX = /^Forwarding\(\{[A-Za-z0-9_\|]+(,\s*[A-Za-z0-9_\|]+)*\}\)$/;
 
     // Regex that validates a term
-    // Matches Constants, Operants and Label References
-    private static readonly TERM_REGEX =
-        /^(\s*|!|TRUE|FALSE|\|\||&&|\(|\)|([A-Za-z][A-Za-z0-9_]*\.[A-Za-z][A-Za-z0-9_]*))+$/;
+    // Has the label type and label value that should be set as capturing groups.
+    private static readonly TERM_REGEX = /^(\s*|!|TRUE|FALSE|\|\||&&|\(|\)|([A-Za-z0-9_]*\.[A-Za-z0-9_]*))+$/;
 
     // Regex matching alphanumeric characters.
     public static readonly REGEX_ALPHANUMERIC = /[A-Za-z0-9_\|]+/;