python - 如何捕获前瞻性后视正则表达式 python

Question

这是一个字符串:

str = "Academy \nADDITIONAL\nAwards and Recognition: Greek Man of the Year 2011 Stanford PanHellenic Community, American Delegate 2010 Global\nEngagement Summit, Honorary Speaker 2010 SELA Convention, Semi-Finalist 2010 Strauss Foundation Scholarship Program\nComputer Skills: Competency: MATLAB, MySQL/PHP, JavaScript, Objective-C, Git Proficiency: Adobe Creative Suite, Excel\n(highly advanced), PowerPoint, HTML5/CSS3\nLanguages: Fluent English, Advanced Spanish\n\x0c"

我想从“ADDTIONAL”捕获到“Languages”，所以我写了这个正则表达式:

regex = r'(?<=\n(ADDITIONAL|Additional)\n)[\s\S]+?(?=\n(Languages|LANGUAGES)\n*)'

但是它只捕获 ([\s\S]+) 之间的所有内容。它不会捕获 ADDTIONAL 和 Languages。我在这里缺少什么？

Answer 1

你的正则表达式是

regex = r'(?<=\n(ADDITIONAL|Additional)\n)[\s\S]+?(?=\n(Languages|LANGUAGES)\n*)'

你的字符串是

Academy \nADDITIONAL\nAwards and Recognition: ... \nLanguages:
                     ^^                          ^^
                     ||                          ||
Match Position:-(?<=\n(ADDITIONAL|Additional)\n)(?=\n(Languages|LANGUAGES)\n*)

因此 [\s\S]+? 将包含这两个位置之间的内容，不包括 ADDITIONAL 和 LANGUAGES。

您只需找到ADDITIONAL 的起始位置和LANGUAGES 的结束位置。这可以使用以下正则表达式完成

(?=\n(ADDITIONAL|Additional)\n)([\s\S]+?)(?<=\n(Languages|LANGUAGES)\b)

此外，如果您希望 [\s\S]+? 只捕获所有内容，那么您可以对 Additional 和 Languages 使用非捕获组

(?=\n(?:ADDITIONAL|Additional)\n)[\s\S]+?(?<=\n(?:Languages|LANGUAGES)\b)

Academy \nADDITIONAL\nAwards and Recognition: ... \nLanguages:
        ^^                                                  ^^
        ||                                                  ||
(?=\n(ADDITIONAL|Additional)\n)             (?<=\n(Languages|LANGUAGES))

Python 代码

p = re.compile(r'(?=\n(?:ADDITIONAL|Additional)\n)[\s\S]+?(?<=\n(?:Languages|LANGUAGES)\b)', re.MULTILINE)
test_str = "Academy \nADDITIONAL\nAwards and Recognition: Greek Man of the Year 2011 Stanford PanHellenic Community, American Delegate 2010 Global\nEngagement Summit, Honorary Speaker 2010 SELA Convention, Semi-Finalist 2010 Strauss Foundation Scholarship Program\nComputer Skills: Competency: MATLAB, MySQL/PHP, JavaScript, Objective-C, Git Proficiency: Adobe Creative Suite, Excel\n(highly advanced), PowerPoint, HTML5/CSS3\nLanguages: Fluent English, Advanced Spanish\n\x0c"
print(re.findall(p, test_str))

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