python regex -在模式后面选择单词
python regex -在模式后面选择单词
提问于 2021-10-28 18:47:20
案文：
- 管理，食品员工和有条件的员工；知识，责任和报告-意见:没有书面的员工健康政策在现场。必须为所有员工提供服务。优先基金会违规行为7-38-010引证。5.对呕吐和腹泻事件作出反应的程序-评论:没有书面清洁程序或呕吐/腹泻事件所需的设备。必须提供。优先基金会违规行为7-38-005引证发布。25.为生/未熟食物提供的消费者咨询-评论:菜单不披露和通知消费者未煮熟或未煮熟的特定菜单项，以及食用这类食物的潜在危险。必须提供一个消费者咨询，以披露和提醒客户这类项目。优先基金会违规行为。没有发出引证。38.
问题：
案文的章节包括第3、5、25和38节(后面是开始索引)。我想在“-注释：”之后，在下一节的开始索引之前，从一个部分中提取所有文本。
def comments(x):
result = []
for elem in df['Violations']:
matches = re.findall(r'\d+\. (.*?)(?: - |\r?\n|$)', elem)
result.extend(matches)
print(result)附加的代码正在执行完全相反的抽取，它只提取'-注释‘之前的单词：’，我如何才能更改它？
非常感谢
回答 2
Stack Overflow用户
回答已采纳
发布于 2021-10-28 19:31:32
如果您希望在Comments:和|之间使用文本，那么在regex中使用这些值。
'Comments: ([^\|]*) \|'它使用()只捕获Comments:和|之间的字符，但与|不同(参见[^\|])。
因为|在regex中有特殊的含义，所以我使用\|作为文本中的普通字符。
或
'Comments: (.*?) \|'它使用?获取与|不同的字符
import re
elem = '''MANAGEMENT, FOOD EMPLOYEE AND CONDITIONAL EMPLOYEE; KNOWLEDGE, RESPONSIBILITIES AND REPORTING - Comments: NO WRITTEN EMPLOYEE HEALTH POLICY ON SITE. MUST PROVIDE FOR ALL EMPLOYEES. PRIORITY FOUNDATION VIOLATION 7-38-010 CITATION ISSUED. | 5. PROCEDURES FOR RESPONDING TO VOMITING AND DIARRHEAL EVENTS - Comments: NO WRITTEN CLEANING PROCEDURE OR REQUIRED EQUIPMENT FOR A VOMITING/DIARRHEA EVENT. MUST PROVIDE. PRIORITY FOUNDATION VIOLATION 7-38-005 CITATION ISSUED. | 25. CONSUMER ADVISORY PROVIDED FOR RAW/UNDERCOOKED FOOD - Comments: MENU DOES NOT DISCLOSE AND INFORM CONSUMERS THE SPECIFIC MENU ITEMS THAT ARE RAW OR UNDER COOKED AND A POTENTIAL HAZARD OF CONSUMING SUCH FOOD. MUST PROVIDE A CONSUMER ADVISORY THAT DISCLOSES AND REMINDS CUSTOMERS OF SUCH ITEMS. PRIORITY FOUNDATION VIOLATION. NO CITATION ISSUED. | 38.'''
#matches = re.findall('Comments: ([^\|]*) \|', elem)
matches = re.findall('Comments: (.*?) \|', elem)
#print(matches)
for item in matches:
print(item)
print('---')结果：
NO WRITTEN EMPLOYEE HEALTH POLICY ON SITE. MUST PROVIDE FOR ALL EMPLOYEES. PRIORITY FOUNDATION VIOLATION 7-38-010 CITATION ISSUED.
---
NO WRITTEN CLEANING PROCEDURE OR REQUIRED EQUIPMENT FOR A VOMITING/DIARRHEA EVENT. MUST PROVIDE. PRIORITY FOUNDATION VIOLATION 7-38-005 CITATION ISSUED.
---
MENU DOES NOT DISCLOSE AND INFORM CONSUMERS THE SPECIFIC MENU ITEMS THAT ARE RAW OR UNDER COOKED AND A POTENTIAL HAZARD OF CONSUMING SUCH FOOD. MUST PROVIDE A CONSUMER ADVISORY THAT DISCLOSES AND REMINDS CUSTOMERS OF SUCH ITEMS. PRIORITY FOUNDATION VIOLATION. NO CITATION ISSUED.Stack Overflow用户
发布于 2021-10-28 21:47:52
您的模式在-、换行符或字符串结尾之前尽可能地捕获组中的文本，并且与Comments:不匹配任何部分。
您可以通过匹配注释来更改它，并在后面为文本添加一个捕获组。
\d+\. .*?(?: - Comments:\s*)(.*?)(?: \||$)更精确的匹配可能是匹配每个文本的开头，即数字、一个点和一个空格，然后匹配直到第一次出现-Comments:而不跨越另一个文本的开始。
在注释之后，您可以使用捕获组来捕获到文本的下一次出现，或者断言字符串的末尾(如果它是最后一个文本)。
使用re.findall将返回捕获组1的值。
\b\d+\. (?:(?!\d+\. |- Comments:).)*- Comments:\s*(.*?)(?: \||$)模式匹配：
\b阻止部分单词匹配的单词边界\d+\.匹配1+数字、点和空格(?:(?!\d+\. |- Comments:).)*匹配任何字符，如果直接在右边没有模式\d+\.或- Comments- Comments:\s*匹配- Comments:，后面跟着可选的空格字符(.*?)捕获组1，尽可能匹配任何字符(?: \||$)匹配
示例
import re
regex = r"\b\d+\. (?:(?!\d+\. |- Comments:).)*- Comments:\s*(.*?)(?: \||$)"
s = "3. MANAGEMENT, FOOD EMPLOYEE AND CONDITIONAL EMPLOYEE; KNOWLEDGE, RESPONSIBILITIES AND REPORTING - Comments: NO WRITTEN EMPLOYEE HEALTH POLICY ON SITE. MUST PROVIDE FOR ALL EMPLOYEES. PRIORITY FOUNDATION VIOLATION 7-38-010 CITATION ISSUED. | 5. PROCEDURES FOR RESPONDING TO VOMITING AND DIARRHEAL EVENTS - Comments: NO WRITTEN CLEANING PROCEDURE OR REQUIRED EQUIPMENT FOR A VOMITING/DIARRHEA EVENT. MUST PROVIDE. PRIORITY FOUNDATION VIOLATION 7-38-005 CITATION ISSUED. | 25. CONSUMER ADVISORY PROVIDED FOR RAW/UNDERCOOKED FOOD - Comments: MENU DOES NOT DISCLOSE AND INFORM CONSUMERS THE SPECIFIC MENU ITEMS THAT ARE RAW OR UNDER COOKED AND A POTENTIAL HAZARD OF CONSUMING SUCH FOOD. MUST PROVIDE A CONSUMER ADVISORY THAT DISCLOSES AND REMINDS CUSTOMERS OF SUCH ITEMS. PRIORITY FOUNDATION VIOLATION. NO CITATION ISSUED. | 38. "
print(re.findall(regex, s))输出
[
'NO WRITTEN EMPLOYEE HEALTH POLICY ON SITE. MUST PROVIDE FOR ALL EMPLOYEES. PRIORITY FOUNDATION VIOLATION 7-38-010 CITATION ISSUED.',
'NO WRITTEN CLEANING PROCEDURE OR REQUIRED EQUIPMENT FOR A VOMITING/DIARRHEA EVENT. MUST PROVIDE. PRIORITY FOUNDATION VIOLATION 7-38-005 CITATION ISSUED.',
'MENU DOES NOT DISCLOSE AND INFORM CONSUMERS THE SPECIFIC MENU ITEMS THAT ARE RAW OR UNDER COOKED AND A POTENTIAL HAZARD OF CONSUMING SUCH FOOD. MUST PROVIDE A CONSUMER ADVISORY THAT DISCLOSES AND REMINDS CUSTOMERS OF SUCH ITEMS. PRIORITY FOUNDATION VIOLATION. NO CITATION ISSUED. '
]页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69759396
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