diff --git a/src/djlint/rules.yaml b/src/djlint/rules.yaml
index 77c81d0..8dadc20 100644
--- a/src/djlint/rules.yaml
+++ b/src/djlint/rules.yaml
@@ -209,8 +209,8 @@
     exclude:
     - django
     patterns:
-    - <(?:/?(?:\w+)\b(?:\"[^\"]*\"|'[^']*'|{[^}]*}|[^'\">{}/])*=([\"'])(?:(?!\1).)*?({%)[^-])\s*?(?:if|for|else|end)
-    - <(?:/?(?:\w+)\b(?:\"[^\"]*\"|'[^']*'|{[^}]*}|[^'\">{}/])*=([\"'])(?:(?!\1).)*?{%(?:(?!%}).)*(?:if|else|for|end)(?:(?!%}).)*[^-](%}))
+    - <(?:/?(?:\w+)\b(?:\"[^\"]*\"|'[^']*'|{[^}]*}|[^'\">{}/])*(?<!\bclass)=([\"'])(?:(?!\1).)*?({%)[^-])\s*?(?:if|for|else|end)
+    - <(?:/?(?:\w+)\b(?:\"[^\"]*\"|'[^']*'|{[^}]*}|[^'\">{}/])*(?<!\bclass)=([\"'])(?:(?!\1).)*?{%(?:(?!%}).)*(?:if|else|for|end)(?:(?!%}).)*[^-](%}))
 - rule:
     name: H029
     message: Consider using lowercase form method values.
diff --git a/tests/test_linter.py b/tests/test_linter.py
index a4d4b91..6e1d43d 100644
--- a/tests/test_linter.py
+++ b/tests/test_linter.py
@@ -7,7 +7,7 @@ run::
 
    # for a single test
 
-   pytest tests/test_linter.py::test_H025 --cov=src/djlint --cov-branch \
+   pytest tests/test_linter.py::test_T028 --cov=src/djlint --cov-branch \
          --cov-report xml:coverage.xml --cov-report term-missing
 
 """
@@ -520,6 +520,11 @@ def test_T028(runner: CliRunner, tmp_file: TextIO) -> None:
     result = runner.invoke(djlint, [tmp_file.name])
     assert "T028" not in result.output
 
+    # class should not trigger
+    write_to_file(tmp_file.name, b'<input class="{% if %}{% endif %}" />')
+    result = runner.invoke(djlint, [tmp_file.name])
+    assert "T028" not in result.output
+
 
 def test_H029(runner: CliRunner, tmp_file: TextIO) -> None:
     write_to_file(tmp_file.name, b'<forM method="Post">')