python - 读取 PDF 文件并使用正则表达式过滤内容

Question

我正在尝试使用正则表达式过滤 PDF 文件，并且输出仅是正则表达式正在过滤的单词。

这是我的代码:

# FILTER PDF CONTENT FOR PHI USING REGEX

import PyPDF2
import re
# creating a pdf file object 
pdfFileObj = open('pdf.pdf', 'rb')

# creating a pdf reader object 
pdfReader = PyPDF2.PdfFileReader(pdfFileObj) 


# creating a page object 
pageObj = pdfReader.getPage(0) 

# extracting text from page 
read=pageObj.extractText()

regex2 = re.compile(r'(?:flexibility|Alaska|)')

e=regex2.findall(read)
print(e)

这是我的输出:

['', '','', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'flexibility', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', ''

如果向右滚动，您可以看到我找到了我的正则表达式单词(灵 active )，但为什么所有逗号都在那里？有任何想法吗？我可能遗漏了一个小细节，但似乎找不到哪里？

读取输出:

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Answer 1

模式的末尾有一个 | ，后面没有任何字符，它将匹配任何内容。删除它:

regex2 = re.compile(r'(?:flexibility|Alaska)')

e=regex2.findall(ReSearch)

此外，通过这样一个简单的模式，您可以删除非捕获组:

regex2 = re.compile(r'flexibility|Alaska')