Fix Jinja2 template errors from invalid parameter/block names with special characters (SKY-7356) (#4644)

skyvern/utils/templating.py

@@ -7,6 +7,28 @@ class Constants:
     MissingVariablePattern = var_pattern = r"\{\{\s*([a-zA-Z_][a-zA-Z0-9_.\[\]'\"]*)\s*\}\}"
 
 
+def replace_jinja_reference(text: str, old_key: str, new_key: str) -> str:
+    """Replaces jinja-style references in a string.
+
+    Handles patterns like {{oldKey}}, {{oldKey.field}}, {{oldKey | filter}}, {{oldKey[0]}}
+
+    Args:
+        text: The text to search in
+        old_key: The key to replace (without braces)
+        new_key: The new key to use (without braces)
+
+    Returns:
+        The text with references replaced
+    """
+    # Match {{oldKey}} or {{oldKey.something}} or {{oldKey | filter}} or {{oldKey[0]}} etc.
+    # Use negative lookahead to ensure key is not followed by identifier characters,
+    # which prevents matching {{keyOther}} when searching for {{key}}
+    # Capture whitespace after {{ to preserve formatting (e.g., "{{ key }}" stays "{{ newKey }}")
+    escaped_old_key = re.escape(old_key)
+    pattern = rf"\{{\{{(\s*){escaped_old_key}(?![a-zA-Z0-9_])"
+    return re.sub(pattern, rf"{{{{\1{new_key}", text)
+
+
 def get_missing_variables(template_source: str, template_data: dict) -> set[str]:
     # quick check - catch top-level undefineds
     env = Environment(undefined=StrictUndefined)