Question

我想从json文件中提取垃圾邮件的主题，但是主题可以在文件中的任何位置，在“内容”或“标题”或“正文”内。使用正则表达式，尽管使用下面的代码，我也无法提取主题：有人可以指出以下正则表达式或代码中的错误之处吗？

import re
import json
with open("test.json", 'r') as fp:
    json_decode = json.loads(fp.read())


p = re.compile('([\[\(] *)?.*(RE?S?|FWD?|re\[\d+\]?) *([-:;)\]][ :;\])-]*|$)|\]+ *$', re.IGNORECASE)
for line in json_decode:
    print(p.sub('', line).strip())

输出（不正确）：主体

我的test.json文件是这样的：

    {'attachment': [{'content_header': {'content-disposition': ['attachment; '
                                                        'filename="image006.jpg"'],
                                'content-id': ['<image006.jpg@01D35D21.756FEE10>']
     'body': [{'content': ' \n'
                  ' \n'
                  'From: eCard Delivery [mailto:ecards@789greeting.com] \n'
                  'Sent: Monday, November 13, 2017 9:14 AM\n'
                  'To: Zhang, Jerry (352A-Affiliate) '

                  'Subject: Warmest Wishes! You have a Happy Thanksgiving '
                  'ecard delivery!\n'
                  ' \n'
                  ' \tDear Jerry,\n'
     'header': {'date': '2017-11-14T08:20:42-08:00',

        'header': {'accept-language': ['en-US'],
                   'content-language': ['en-US'],
                   'content-type': ['multipart/mixed; '
                                    'boundary="--boundary-LibPST-iamunique-1500317751_-_-"'],
                   'date': ['Tue, 14 Nov 2017 08:20:42 -0800']
                   'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving '
                   'ecard delivery!'}}

^上面是json文件的正确格式。

Answer 1

好的-现在，鉴于您的原始JSON文件可能不包含newline characters的事实，我希望这种方法行之有效，甚至可能更准确

>>> string = '''{'attachment': [{'content_header': {'content-disposition': ['attachment; ''filename="image006.jpg"'],'content-id': ['<image006.jpg@01D35D21.756FEE10>'] 'body': [{'content': ' '' ''From: eCard Delivery [mailto:ecards@789greeting.com] ''Sent: Monday, November 13, 2017 9:14 AM''To: Zhang, Jerry (352A-Affiliate) ''Subject: Warmest Wishes! You have a Happy Thanksgiving ''ecard delivery!'' ''   Dear Jerry,' 'header': {'date': '2017-11-14T08:20:42-08:00','header': {'accept-language': ['en-US'], 'content-language': ['en-US'], 'content-type': ['multipart/mixed; ''boundary="--boundary-LibPST-iamunique-1500317751_-_-"'], 'date': ['Tue, 14 Nov 2017 08:20:42 -0800'] 'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving ' 'ecard delivery!'}}'''

>>> subjects_test = re.findall('([\'|\"]*[\S]ubject[\S\s]+?[\'|\"]+)(?=\n|$|\s|\})', string)


>>> for subject in subjects_test:
        print(subject)



#OUPUT: #Kind of off I guess, but I don't know the full format of the file so this is the safest bet    

''Subject: Warmest Wishes! You have a Happy Thanksgiving ''ecard delivery!''
'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving '

编辑-使用上面提供的字符串，在下面给出您的评论。希望我了解您的要求。我使用了我提供的两个正则表达式示例。

>>> string = '''{'attachment': [{'content_header': {'content-disposition': ['attachment; '
                                                    'filename="image006.jpg"'],
                            'content-id': ['<image006.jpg@01D35D21.756FEE10>']
 'body': [{'content': ' \n'
              ' \n'
              'From: eCard Delivery [mailto:ecards@789greeting.com] \n'
              'Sent: Monday, November 13, 2017 9:14 AM\n'
              'To: Zhang, Jerry (352A-Affiliate) '

              'Subject: Warmest Wishes! You have a Happy Thanksgiving '
              'ecard delivery!\n'
              ' \n'
              ' \tDear Jerry,\n'
 'header': {'date': '2017-11-14T08:20:42-08:00',

    'header': {'accept-language': ['en-US'],
               'content-language': ['en-US'],
               'content-type': ['multipart/mixed; '
                                'boundary="--boundary-LibPST-iamunique-1500317751_-_-"'],
               'date': ['Tue, 14 Nov 2017 08:20:42 -0800']
               'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving '
               'ecard delivery!'}}'''



>>> subjects_test_1 = re.findall('([\'\"]*[S|s]ubject[:\s]*?(?:[\'|\"]*[\S\s]*?(?=[\'|\"])*))(?=\n|$)', string)


>>> for subject in subjects_test_1:
        print(subject)

#OUPUT: 
'Subject: Warmest Wishes! You have a Happy Thanksgiving '
'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving '


########################################################

>>> subjects_test_2 = re.findall('([\'|\"]*[\S]ubject[\S\s]+?[\'|\"]*)(?=\n|$)', string)


>>> for subject in subjects_test_2:
        print(subject)

#OUPUT: 
'Subject: Warmest Wishes! You have a Happy Thanksgiving '
'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving '

。

或尝试使用此功能：

对于调用函数的行，将'PATH_TO_YOUR_FILE'替换为...，您知道文件的路径...

>>> def email_subject_parse(file_path):
        import re
        email_subjects = []
        try:
            with open(file_path) as file:
                string = file.read()
                email_subjects = re.findall('([\'\"]*[S|s]ubject[:\s]*?(?:[\'|\"]*[\S\s]*?(?=[\'|\"])*))(?=\n|$)', string)
                #Or less complicated 
                #email_subjects = re.findall('([\'|\"]*[\S]ubject[\S\s]+?[\'|\"]*)(?=\n|$)', string)
                return email_subjects
        except:
            print('You have likely provided a bad file path')


>>> subjects = email_subject_parse('PATH_TO_YOUR_FILE')


>>> for subject in subjects:
        print(subject)



#OUPUT: 
'Subject: Warmest Wishes! You have a Happy Thanksgiving '
'subject': 'FW: Warmest Wishes! You have a Happy Thanksgiving '

如何从python文件中提取电子邮件的主题？

1 个答案: