[ruff] re and regex calls with unraw string as first argument (RUF039) (#14446)

crates/ruff_linter/resources/test/fixtures/ruff/RUF039.py

@@ -0,0 +1,55 @@
+import re
+import regex
+
+# Errors
+re.compile('single free-spacing', flags=re.X)
+re.findall('si\ngle')
+re.finditer("dou\ble")
+re.fullmatch('''t\riple single''')
+re.match("""\triple double""")
+re.search('two', 'args')
+re.split("raw", r'second')
+re.sub(u'''nicode''', u"f(?i)rst")
+re.subn(b"""ytes are""", f"\u006e")
+
+regex.compile('single free-spacing', flags=regex.X)
+regex.findall('si\ngle')
+regex.finditer("dou\ble")
+regex.fullmatch('''t\riple single''')
+regex.match("""\triple double""")
+regex.search('two', 'args')
+regex.split("raw", r'second')
+regex.sub(u'''nicode''', u"f(?i)rst")
+regex.subn(b"""ytes are""", f"\u006e")
+
+regex.template("""(?m)
+    (?:ulti)?
+    (?=(?<!(?<=(?!l)))
+    l(?i:ne)
+""", flags = regex.X)
+
+
+# No errors
+re.compile(R'uppercase')
+re.findall(not_literal)
+re.finditer(0, literal_but_not_string)
+re.fullmatch()  # no first argument
+re.match('string' f'''concatenation''')
+re.search(R"raw" r'concatenation')
+re.split(rf"multiple", f"""lags""")
+re.sub(FR'ee', '''as in free speech''')
+re.subn(br"""eak your machine with rm -""", rf"""/""")
+
+regex.compile(R'uppercase')
+regex.findall(not_literal)
+regex.finditer(0, literal_but_not_string)
+regex.fullmatch()  # no first argument
+regex.match('string' f'''concatenation''')
+regex.search(R"raw" r'concatenation')
+regex.split(rf"multiple", f"""lags""")
+regex.sub(FR'ee', '''as in free speech''')
+regex.subn(br"""eak your machine with rm -""", rf"""/""")
+
+regex.splititer(both, non_literal)
+regex.subf(f, lambda _: r'means', '"format"')
+regex.subfn(fn, f'''a$1n't''', lambda: "'function'")

crates/ruff_linter/resources/test/fixtures/ruff/RUF039_concat.py

@@ -0,0 +1,93 @@
+import re
+
+
+re.compile(
+    'implicit'
+    'concatenation'
+)
+re.findall(
+    r'''
+    multiline
+    '''
+    """
+    concatenation
+    """
+)
+re.finditer(
+    f'(?P<{group}>Dynamic'
+    r'\s+group'
+    'name)'
+)
+re.fullmatch(
+    u'n'r'''eadable'''
+    f'much?'
+)
+re.match(
+    b'reak'
+    br'eak'
+)
+re.search(
+    r''u''
+    '''okay?'''
+)
+re.split(''U"""w"""U'')
+re.sub(
+    "I''m o"
+    'utta ideas'
+)
+re.subn("()"r' am I'"??")
+
+
+import regex
+
+
+regex.compile(
+    'implicit'
+    'concatenation'
+)
+regex.findall(
+    r'''
+    multiline
+    '''
+    """
+    concatenation
+    """
+)
+regex.finditer(
+    f'(?P<{group}>Dynamic'
+    r'\s+group'
+    'name)'
+)
+regex.fullmatch(
+    u'n'r'''eadable'''
+    f'much?'
+)
+regex.match(
+    b'reak'
+    br'eak'
+)
+regex.search(
+    r''u''
+    '''okay?'''
+)
+regex.split(''U"""w"""U'')
+regex.sub(
+    "I''m o"
+    'utta ideas'
+)
+regex.subn("()"r' am I'"??")
+
+
+regex.template(
+    r'''kitty says'''
+    r""r''r""r'aw'r""
+)
+regex.splititer(
+    r'r+r*r?'
+)
+regex.subf(
+    rb"haha"
+    br"ust go"
+    br''br""br''
+)
+regex.subfn(br'I\s\nee*d\s[O0o]me\x20\Qoffe\E, ' br'b')