如何使用re.search语法来匹配pdf文档中的关键字列表？

import re
import PyPDF2

pdf_file = open('example.pdf', 'rb')
pdf_reader = PyPDF2.PdfFileReader(pdf_file)

keywords = ['keyword1', 'keyword2', 'keyword3']

for page_num in range(pdf_reader.numPages):
    page = pdf_reader.getPage(page_num)
    page_text = page.extractText()

for keyword in keywords:
    if re.search(keyword, page_text, re.IGNORECASE):
        print(f"关键字 {keyword} 在第 {page_num+1} 页中找到了。")

import re
import PyPDF2

pdf_file = open('example.pdf', 'rb')
pdf_reader = PyPDF2.PdfFileReader(pdf_file)

keywords = ['keyword1', 'keyword2', 'keyword3']

for page_num in range(pdf_reader.numPages):
    page = pdf_reader.getPage(page_num)
    page_text = page.extractText()

    for keyword in keywords:
        if re.search(keyword, page_text, re.IGNORECASE):
            print(f"关键字 {keyword} 在第 {page_num+1} 页中找到了。")

pdf_file.close()