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Accepted
khteh
Asked: 2025-02-13 14:32:27 +0800 CST

如何匹配“C”、“C++”或“C#”？[重复]

  • 772

我有以下测试用例：

CPP_CSHARP_REGEX_TEST_CASES = [
    ("C++", True),
    ("C#", True),
    ("C+", False),
    ("C##", False),
    ("C", True),
]

我可以使用哪个正则表达式来通过 pytest？我尝试过r"^C[+{2},#{1}]$" Tim Biegeleisen 的解决方案，但失败了C：

________________________________________________________________________________ test_cpp_csharpRegex[C-True] ________________________________________________________________________________

data = 'C', expected = True

    @pytest.mark.parametrize("data, expected", CPP_CSHARP_REGEX_TEST_CASES)
    def test_cpp_csharpRegex(data, expected):
        cpp_csharp_regex = r"\bC(?:\+\+|#)(?=\s|$)"
>       assert expected == bool(re.match(cpp_csharp_regex, data))
E       AssertionError: assert True == False
E        +  where False = bool(None)
E        +    where None = <function match at 0x7ab4e2cded40>('\\bC(?:\\+\\+|#)(?=\\s|$)', 'C')
E        +      where <function match at 0x7ab4e2cded40> = re.match

regex_test.py:131: AssertionError
================================================================================== short test summary info ===================================================================================
FAILED regex_test.py::test_cpp_csharpRegex[C-True] - AssertionError: assert True == False
================================================================================ 1 failed, 70 passed in 0.08s ================================================================================
regex

1 个回答

  1. Best Answer

    假设您希望这些匹配是整个输入字符串，那么使用：

    ^C(?:\+\+|#)?$

    如果您想要捕获这些匹配项（可能作为更大字符串的一部分），并且匹配项被空格包围，则使用：

    \bC(?:\+\+|#)?(?!\S)
    • 1

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