fix(formatter): function index was not formatted correctly

closes #693

src/djlint/formatter/indent.py

@@ -387,15 +387,16 @@ def format_function(config: Config, html: str, match: re.Match) -> str:
         leading_space = match.group(1)
         open_bracket = match.group(2)
         tag = match.group(3).strip()
-        close_bracket = match.group(5)
+        index = (match.group(5) or "").strip()
+        close_bracket = match.group(6)
         contents = format_data(
             config,
             match.group(4).strip()[1:-1],
             len(f"{open_bracket} {tag}() {close_bracket}"),
             leading_space,
         )
 
-        return f"{leading_space}{open_bracket} {tag}({contents}) {close_bracket}"
+        return f"{leading_space}{open_bracket} {tag}({contents}){index} {close_bracket}"
 
     if config.no_set_formatting is False:
         func = partial(format_set, config, beautified_code)
@@ -414,7 +415,7 @@ def format_function(config: Config, html: str, match: re.Match) -> str:
         # format function contents
         beautified_code = re.sub(
             re.compile(
-                r"([ ]*)({{-?\+?)[ ]*?((?:(?!}}).)*?\w)(\((?:\"[^\"]*\"|'[^']*'|[^\)])*?\)[ ]*)((?:(?!}}).)*?-?\+?}})",
+                r"([ ]*)({{-?\+?)[ ]*?((?:(?!}}).)*?\w)(\((?:\"[^\"]*\"|'[^']*'|[^\)])*?\)[ ]*)((?:\[[^\]]*?\]|\.\d+)[ ]*)?((?:(?!}}).)*?-?\+?}})",
                 flags=re.IGNORECASE | re.MULTILINE | re.VERBOSE | re.DOTALL,
             ),
             func,

tests/test_nunjucks/test_functions.py

@@ -28,6 +28,12 @@
         ({}),
         id="test quoting",
     ),
+    pytest.param(
+        ('{{ item.split("/")[1] }}\n' '{{ item.split("/").123 }}'),
+        ('{{ item.split("/")[1] }}\n' '{{ item.split("/").123 }}\n'),
+        ({}),
+        id="test index",
+    ),
     pytest.param(
         (
             "{{ myfunc({\n"