fix #1052: template tag inside template tag

djlint/formatter/expand.py

@@ -112,9 +112,7 @@ def should_i_move_template_tag(
 
     # break after
     return re.sub(
-        r"((?:{%|{{\#)[ ]*?(?:"
-        + config.break_template_tags
-        + ")[^}]+?[%}]})(?=[^\n])",
+        rf"((?:{{%|{{{{\#)[ ]*?(?:{config.break_template_tags})(?>{config.template_tags}|[^}}])+?[%}}]}})(?=[^\n])",
         partial(should_i_move_template_tag, "%s\n"),
         html,
         flags=RE_FLAGS_IMX,

tests/test_django/test_templatetag_ext.py

@@ -0,0 +1,33 @@
+"""Test template tag extended usage.
+
+uv run pytest tests/test_django/test_templatetag_ext.py
+"""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import pytest
+
+from djlint.reformat import formatter
+from tests.conftest import config_builder, printer
+
+if TYPE_CHECKING:
+    from typing import Any
+
+test_data = [
+    pytest.param(
+        ('{% component "img" src="{% url \'my_image\' %}" %}'),
+        ('{% component "img" src="{% url \'my_image\' %}" %}\n'),
+        ({"custom_blocks": "component"}),
+        id="template_tag_inside_template_tag",
+    )
+]
+
+
+@pytest.mark.parametrize(("source", "expected", "args"), test_data)
+def test_base(source: str, expected: str, args: dict[str, Any]) -> None:
+    output = formatter(config_builder(args), source)
+
+    printer(expected, source, output)
+    assert expected == output