Python try 使用RegEx解析由标识多行文本数据的3行头组成的日志(log)文件

您可以使用非贪婪修饰符修改regex组以减少捕获组数+(regex101):

import re

text = """\
===================
DateTimeStamp - ShortSummaryOfEntry
===================

1 Line 1 of text
2 Line 2 of text
3 Line last of text

===================
DateTimeStamp - ShortSummaryOfEntry
===================

4 Line 1 of text
5 Line 2 of text
6 Line last of text

===================
DateTimeStamp - ShortSummaryOfEntry
===================

7 Line 1 of text
8 Line 2 of text
9 Line last of text"""


pat = r"={19}\n(.+?)\n={19}\s*(.+?)\s*(?=={19}|\Z)"

for title, body in re.findall(pat, text, flags=re.S):
    print(title)
    print(body)
    print("-" * 80)

打印:

DateTimeStamp - ShortSummaryOfEntry
1 Line 1 of text
2 Line 2 of text
3 Line last of text
--------------------------------------------------------------------------------
DateTimeStamp - ShortSummaryOfEntry
4 Line 1 of text
5 Line 2 of text
6 Line last of text
--------------------------------------------------------------------------------
DateTimeStamp - ShortSummaryOfEntry
7 Line 1 of text
8 Line 2 of text
9 Line last of text
--------------------------------------------------------------------------------