kevinya

正規運算式匹配單筆的範例：

import re
html = 'abcd{111:333,444:555}cdefg'
pattern = r'.*?\{(?P<value>.*?)\}.*?'
# DOTALL：就是csharp裡面的singleline
pattern = re.compile(pattern, re.DOTALL)
# 取得匹配結果，無法匹配返回 None
match = pattern.match(html)
 
if match:
    # 得到匹配結果
    print(match.group('value'))

正規運算式匹配多筆的範例：

html = "<p>旅行名稱：去韓國玩，價錢：5,000，日期：2018/03/20</p><p>旅行名稱：去日本玩，價錢：8,000，日期：2018/07/15</p>"
pattern = r'旅行名稱：(?P<TourName>.*?)，價錢：(?P<Price>[\d,]+)，日期：(?P<Date>\d{4}/\d{2}/\d{2})</p>'

import re
# DOTALL：就是csharp裡面的singleline
pattern = re.compile(pattern, re.DOTALL)
for m in pattern.finditer(html):
  print(m.group('TourName'))  
  print(m.group('Price'))  
  print(m.group('Date'))    
print('program end')

快速測試上述範例的網址：
https://regex101.com/r/E3jFCm/1

參考資料：
[Python] 正規表示法 Regular Expression
http://zwindr.blogspot.com/2016/01/python-regular-expression.html
re.findall which returns a dict of named capturing groups?
https://stackoverflow.com/questions/11103856/re-findall-which-returns-a-dict-of-named-capturing-groups
Capturing named groups in regex with re.findall
https://stackoverflow.com/questions/25628973/capturing-named-groups-in-regex-with-re-findall