python - 在 Python 正则表达式中动态命名组

Question

有没有办法在 Python 中动态更新正则表达式组的名称？

例如，如果文本是:

person 1: name1
person 2: name2
person 3: name3
...
person N: nameN

如果事先不知道有多少人，你会如何命名组“person1”、“person2”、“person3”、...和“personN”？

Answer 1

不，但是你可以这样做:

>>> import re
>>> p = re.compile('(?m)^(.*?)\\s*:\\s*(.*)$')
>>> text = '''person 1: name1
person 2: name2
person 3: name3
...
person N: nameN'''
>>> p.findall(text)

输出:

[('person 1', 'name1'), ('person 2', 'name2'), ('person 3', 'name3'), ('person N', 'nameN')]

快速解释:

(?m)     # enable multi-line mode
^        # match the start of a new line
(.*?)    # un-greedily match zero or more chars and store it in match group 1
\s*:\s*  # match a colon possibly surrounded by space chars
(.*)     # match the rest of the line and store it in match group 2
$        # match the end of the line

引用资料

• 多行模式:http://www.regular-expressions.info/modifiers.html
• 贪婪/非贪婪匹配:http://www.regular-expressions.info/repeat.html
• 匹配组 http://www.regular-expressions.info/brackets.html