使用先行查找将所有内容匹配 到 下一部分标题或字符串的末尾：
re_sections=re.compile(r"(?P<section>Section\d)\s*(?P<section_data>.+?)(?=(?:Section\d|$))", re.DOTALL)
请注意，这也需要一个非贪婪的.+?方法，否则它仍然会一直匹配到最后。
演示：
>>> re_sections=re.compile(r"(?P<section>Section\d)\s*(?P<section_data>.+?)(?=(?:Section\d|$))", re.DOTALL)
>>> for m in re_sections.finditer(text): print m.groupdict()
...
{'section': 'Section1', 'section_data': 'stuff belonging to section1\nstuff belonging to section1\nstuff belonging to section1\n'}
{'section': 'Section2', 'section_data': 'stuff belonging to section2\nstuff belonging to section2\nstuff belonging to section2'}
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