diff --git a/agent_chat/intent_parser.py b/agent_chat/intent_parser.py
index a377e547f..bd99d2b64 100644
--- a/agent_chat/intent_parser.py
+++ b/agent_chat/intent_parser.py
@@ -139,6 +139,10 @@ class IntentParser:
             r"de\s+([A-Za-z])\s+à\s+([A-Za-z])",
             r"(\d+)\s*(?:-|à|to)\s*(\d+)",
         ],
+        "expression": [
+            # Expressions mathématiques : 5+2, 100*3, 12/4, 7-3, 2.5+3.1
+            r"(\d+(?:[.,]\d+)?\s*[+\-*/x×÷]\s*\d+(?:[.,]\d+)?)",
+        ],
     }
 
     def __init__(
diff --git a/data/training/workflows/demo_calculator.json b/data/training/workflows/demo_calculator.json
new file mode 100644
index 000000000..087fd44d7
--- /dev/null
+++ b/data/training/workflows/demo_calculator.json
@@ -0,0 +1,100 @@
+{
+  "workflow_id": "demo_calculator",
+  "name": "Demo - Calculatrice",
+  "description": "Ouvre la calculatrice et effectue un calcul simple",
+  "version": "1.0.0",
+  "created_at": "2024-11-29T10:00:00",
+  "updated_at": "2024-11-29T10:00:00",
+  "learning_state": "OBSERVATION",
+  "execution_count": 0,
+  "entry_nodes": ["start"],
+  "end_nodes": ["end"],
+  "nodes": [
+    {
+      "node_id": "start",
+      "name": "Desktop",
+      "description": "Écran de départ",
+      "template": {
+        "title_pattern": ".*"
+      },
+      "is_entry": true,
+      "is_end": false,
+      "metadata": {}
+    },
+    {
+      "node_id": "calc_open",
+      "name": "Calculatrice ouverte",
+      "description": "La calculatrice est visible",
+      "template": {
+        "title_pattern": ".*(calc|gnome-calculator).*"
+      },
+      "is_entry": false,
+      "is_end": false,
+      "metadata": {}
+    },
+    {
+      "node_id": "end",
+      "name": "Calcul effectué",
+      "description": "Le calcul est affiché",
+      "template": {
+        "title_pattern": ".*"
+      },
+      "is_entry": false,
+      "is_end": true,
+      "metadata": {}
+    }
+  ],
+  "edges": [
+    {
+      "edge_id": "open_calc",
+      "source_node": "start",
+      "target_node": "calc_open",
+      "action": {
+        "type": "compound",
+        "target": {
+          "by_role": null,
+          "selection_policy": "first"
+        },
+        "parameters": {
+          "steps": [
+            {"type": "key_press", "key": "super"},
+            {"type": "wait", "duration_ms": 500},
+            {"type": "text_input", "text": "calculator"},
+            {"type": "key_press", "key": "Return"}
+          ]
+        }
+      },
+      "constraints": {
+        "timeout_ms": 5000
+      },
+      "confidence_threshold": 0.7
+    },
+    {
+      "edge_id": "do_calc",
+      "source_node": "calc_open",
+      "target_node": "end",
+      "action": {
+        "type": "text_input",
+        "target": {
+          "by_role": "button",
+          "selection_policy": "first"
+        },
+        "parameters": {
+          "text": "${expression}=",
+          "defaults": {
+            "expression": "2+2"
+          }
+        }
+      },
+      "constraints": {
+        "timeout_ms": 3000
+      },
+      "confidence_threshold": 0.8
+    }
+  ],
+  "metadata": {
+    "author": "RPA Vision V3",
+    "tags": ["demo", "calculator"],
+    "difficulty": "easy"
+  }
+}