python 字符串模式转换为 json 文件

Question

我有一个代码试图在字符串中找到匹配的模式。我想将这些模式存储在 json 文件中，因此我将这些 python 字符串转换为 json 格式。但是，它不起作用，我得到了不包含正确数量的值的错误匹配。

这就是我的 python 模式列表的样子：

patterns = [
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+)$",       #Vol. 12,  no. 3, (2009), p. 118-120 
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.\[(\d+)-(\d+)\]$", #vol.1,no.7(2022),p.[1-6]
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+-\d+)-(\d+-\d+)$", #vol.10,no.3(2018),p.03015-1-03015-4
    r"^vol\.(\d+),no\.([\d-]+)\((\d+)\)p\.(\d+)-(\d+)$",
    r"^vol(\d+),no\.([\d-]+)\((\d+)\),p\.(\d+)-(\d+)$",
    r"^vol\.(\d+[a-z]?),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+)$", #Vol. 35A, no. 3 (2004), p. 751-759
    r"^vol\.(\d+),no\.([\d,]+)\((\d+)\),p\.(\d+)-(\d+)$", #Vol. 17, no. 7,8,9,10(2020), p. 573 - 582
    r"^vol\.(\d+),no\.([\w]+)\((\d+)\),p\.(\d+)-(\d+)$" # vol.7,no.6C(2019),p.38-45
    ] 

这就是我在 json 中的方式：

{
    "patterns": [
        "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
        "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.\\[(\\d+)-(\\d+)\\]$",
        "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+-\\d+)-(\\d+-\\d+)$",
        "^vol\\.(\\d+),no\\.[\\d-]+\\((\\d+)\\)p\\.(\\d+)-(\\d+)$",
        "^vol(\\d+),no\\.[\\d-]+\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
        "^vol\\.(\\d+[a-z]?),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
        "^vol\\.(\\d+),no\\.[\\d,]+\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
        "^vol\\.(\\d+),no\\.[\\w]+\\((\\d+)\\),p\\.(\\d+)-(\\d+)$"
    ]
}

这是我如何使用它们的示例，并帮助打印错误：

config_filename = "configuration\most_used_patterns_Vol_Iss_Year_Page.json"
config = load_config(config_filename)
if config is not None:
    patterns = config.get('patterns', [])
    
for pattern in patterns:
    match = re.match(pattern, row)
    if match:
        print(pattern)
        print(match)
        groups = match.groups()
        print(groups[0])
        print(groups[1])
        print(groups[2])
        print(groups[3])
        volume, issue, year, start_page, end_page = match.groups()

输出：

^vol\.(\d+),no\.[\d,]+\((\d+)\),p\.(\d+)-(\d+)$
<re.Match object; span=(0, 29), match='vol.37,no.6,7(1987),p.370-377'>
37
1987
370
377
ValueError: not enough values to unpack (expected 5, got 4)

当我不从 json 文件中读取它们，而只是以我提到的形式将它们放入 python 中时，它就可以工作。有人可以向我解释一下这些 json 文件有什么问题吗？或者也许使用不同类型的文件来存储这些字符串模式是更好的选择。

Answer 1

看来你的 JSON 序列化出了问题。

最好使用 python 从输入数据创建 JSON：

patterns = [
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+)$",       #Vol. 12,  no. 3, (2009), p. 118-120 
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.\[(\d+)-(\d+)\]$", #vol.1,no.7(2022),p.[1-6]
    r"^vol\.(\d+),no\.(\d+)\((\d+)\),p\.(\d+-\d+)-(\d+-\d+)$", #vol.10,no.3(2018),p.03015-1-03015-4
    r"^vol\.(\d+),no\.([\d-]+)\((\d+)\)p\.(\d+)-(\d+)$",
    r"^vol(\d+),no\.([\d-]+)\((\d+)\),p\.(\d+)-(\d+)$",
    r"^vol\.(\d+[a-z]?),no\.(\d+)\((\d+)\),p\.(\d+)-(\d+)$", #Vol. 35A, no. 3 (2004), p. 751-759
    r"^vol\.(\d+),no\.([\d,]+)\((\d+)\),p\.(\d+)-(\d+)$", #Vol. 17, no. 7,8,9,10(2020), p. 573 - 582
    r"^vol\.(\d+),no\.([\w]+)\((\d+)\),p\.(\d+)-(\d+)$" # vol.7,no.6C(2019),p.38-45
    ]


import json
with open("patterns.json", "w") as f:
   json.dump({"patterns": patterns}, f, indent=2)

这将为您提供一个包含以下内容的正确 JSON 文件：

{
  "patterns": [
    "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
    "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.\\[(\\d+)-(\\d+)\\]$",
    "^vol\\.(\\d+),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+-\\d+)-(\\d+-\\d+)$",
    "^vol\\.(\\d+),no\\.([\\d-]+)\\((\\d+)\\)p\\.(\\d+)-(\\d+)$",
    "^vol(\\d+),no\\.([\\d-]+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
    "^vol\\.(\\d+[a-z]?),no\\.(\\d+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
    "^vol\\.(\\d+),no\\.([\\d,]+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$",
    "^vol\\.(\\d+),no\\.([\\w]+)\\((\\d+)\\),p\\.(\\d+)-(\\d+)$"
  ]
}

将其读回 python 并将其与原始数据进行比较，应该证明它存储正确。