如何用多行替换PDF中的文本？

import PyPDF2

def replace_text_in_pdf(pdf_path, search_text, replace_text):
    with open(pdf_path, "rb") as file:
        pdf_reader = PyPDF2.PdfFileReader(file)
        pdf_writer = PyPDF2.PdfFileWriter()

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

            if search_text in text:
                new_text = text.replace(search_text, replace_text)
                page = page.createContentStream(new_text)

            pdf_writer.addPage(page)

        with open("output.pdf", "wb") as output_file:
            pdf_writer.write(output_file)

# 使用示例
replace_text_in_pdf("input.pdf", "要替换的文本", "替换后的文本")