Accept backslashes before f-string replacement fields

AUTHORS.txt

@@ -54,6 +54,7 @@ Simon Ruggier (@sruggier)
 Tim Gates (@timgates42) <tim.gates@iress.com>
 Batuhan Taskaya (@isidentical) <isidentical@gmail.com>
 Jocelyn Boullier (@Kazy) <jocelyn@boullier.bzh>
+Rupayon Haldar (@rupayon123)
 
 
 Note: (@user) means a github user name.

CHANGELOG.rst

@@ -6,6 +6,8 @@ Changelog
 Unreleased
 ++++++++++
 
+- Accept backslashes before braces in f-string literal text.
+
 0.8.7 (2026-05-02)
 ++++++++++++++++++
 

parso/python/tokenize.py

@@ -114,10 +114,11 @@ def _get_token_collection(version_info):
 unicode_character_name = r'[A-Za-z0-9\-]+(?: [A-Za-z0-9\-]+)*'
 fstring_string_single_line = _compile(
     r'(?:\{\{|\}\}|\\N\{' + unicode_character_name
-    + r'\}|\\(?:\r\n?|\n)|\\[^\r\nN]|[^{}\r\n\\])+'
+    + r'\}|\\(?:\r\n?|\n)|\\[^\r\nN{}]|\\(?=[{}])|[^{}\r\n\\])+'
 )
 fstring_string_multi_line = _compile(
-    r'(?:\{\{|\}\}|\\N\{' + unicode_character_name + r'\}|\\[^N]|[^{}\\])+'
+    r'(?:\{\{|\}\}|\\N\{' + unicode_character_name
+    + r'\}|\\[^N{}]|\\(?=[{}])|[^{}\\])+'
 )
 fstring_format_spec_single_line = _compile(r'(?:\\(?:\r\n?|\n)|[^{}\r\n])+')
 fstring_format_spec_multi_line = _compile(r'[^{}]+')

test/test_fstring.py

@@ -87,13 +87,35 @@ def test_valid(code, grammar):
     assert fstring.get_code() == code
 
 
+@pytest.mark.parametrize('prefix', ['f', 'rf'])
+@pytest.mark.parametrize('quote', ['"', '"""'])
+@pytest.mark.parametrize('text', [r'\{value}', r'\{value:03o}', r'\{{value}}'])
+def test_backslash_before_brace(prefix, quote, text, each_version):
+    code = prefix + quote + text + quote
+    grammar = load_grammar(version=each_version)
+    module = grammar.parse(code, error_recovery=False)
+    assert module.get_code() == code
+    assert not list(grammar.iter_errors(module))
+
+
+def test_backslash_before_brace_in_call(grammar):
+    code = r'stream.write(b_(rf"\{ord_(c):0>3o}"))'
+    module = grammar.parse(code, error_recovery=False)
+    assert module.get_code() == code
+    assert not list(grammar.iter_errors(module))
+
+
 @pytest.mark.parametrize(
     'code', [
         # an f-string can't contain unmatched curly braces
         'f"}"',
         'f"{"',
         'f"""}"""',
         'f"""{"""',
+        r'f"\}"',
+        r'rf"\}"',
+        r'f"""\}"""',
+        r'rf"""\}"""',
 
         # invalid conversion characters
         'f"{1!{a}}"',