使用regex查找和插入标记

2024-09-27 21:31:34 发布

您现在位置：Python中文网/ 问答频道 /正文
9559 3

我正在把一本书从PDF转换成电子印刷版。但是标题不在header标记中，因此尝试使用regex替换python函数。你知道吗

示例文本：

<p class="calibre1"><a id="p1"></a>Chapter 370: Slamming straight on</p>
<p class="softbreak"> </p>
<p class="calibre1">Hearing Yan Zhaoge’s suggestion, the Jade Sea City martial practitioners here were all stunned.</p>
<p class="calibre1"><a id="p7"></a>Chapter 372: Yan Zhaoge’s plan</p>
<p class="softbreak"> </p>
<p class="calibre1">Yan Zhaoge and Ah Hu sat on Pan-Pan’s back, black water swirling about Pan-Pan’s entire body, keeping away the seawater as he shot forward at lightning speed.</p>

我试着用regex和

def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):

    pattern = r"</a>(?i)chapter [0-9]+: [\w\s]+(.*)<br>"
    list = re.findall(pattern, match.group())

    for x in list:
        x = "</a>(?i)chapter [0-9]+: [\w\s]+(.?)<br>"
        x = s.split("</a>", 1)[0] + '</a><h2>' + s.split("a>",1)[1]
        x = s.split("<br>", 1)[0] + '</h2><br>' + s.split("<br>",1)[1]
    return match.group()

以及


def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):
    pattern = r"</a>(?i)chapter [0-9]+: [\w\s]+(.*)<br>"
    s.replace(re.match(pattern, s), r'<h2>$0')

但仍未达到预期效果。我想要的是。。。你知道吗

输入

</a>Chapter 370: Slamming straight on</p>

输出

</a><h2>Chapter 370: Slamming straight on</h2></p>

在所有类似情况下都要添加h2标签


Tags： bronmatchh2replaceclasspanpattern
2条回答
网友
1楼 · 编辑于 2024-09-27 21:31:34

Jean-François的评论会更好，但是如果我们不得不这么做，我猜我们应该从以下表达式开始：

(<\/a>)([^<]+)?(<\/p>)
(<\/a>)(chapter\s+[0-9]+[^<]+)?(<\/p>)

替换为：

\1<h2>\2</h2>\3

Demo 1

Demo 2

测试

# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility

import re

regex = r"(<\/a>)(chapter\s+[0-9]+[^<]+)?(<\/p>)"

test_str = ("<p class=\"calibre1\"><a id=\"p1\"></a>Chapter 370: Slamming straight on</p>\n"
    "<p class=\"softbreak\"> </p>\n"
    "<p class=\"calibre1\">Hearing Yan Zhaoge’s suggestion, the Jade Sea City martial practitioners here were all stunned.</p>\n"
    "<p class=\"calibre1\"><a id=\"p7\"></a>Chapter 372: Yan Zhaoge’s plan</p>\n"
    "<p class=\"softbreak\"> </p>\n"
    "<p class=\"calibre1\">Yan Zhaoge and Ah Hu sat on Pan-Pan’s back, black water swirling about Pan-Pan’s entire body, keeping away the seawater as he shot forward at lightning speed.</p>")

subst = "\\1<h2>\\2</h2>\\3"

# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0, re.MULTILINE | re.IGNORECASE)

if result:
    print (result)

# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
网友
2楼 · 编辑于 2024-09-27 21:31:34

regex不应用于解析xml。请参见： Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms （Why shouldn't you..会是一个更好的标题）

但是，您可以改用BeautifulSoup：

from bs4 import BeautifulSoup
data = """<p class="calibre1"><a id="p1"></a>Chapter 370: Slamming straight on</p>
<p class="softbreak"> </p>
<p class="calibre1">Hearing Yan Zhaoge’s suggestion, the Jade Sea City martial practitioners here were all stunned.</p>
<p class="calibre1"><a id="p7"></a>Chapter 372: Yan Zhaoge’s plan</p>
<p class="softbreak"> </p>
<p class="calibre1">Yan Zhaoge and Ah Hu sat on Pan-Pan’s back, black water swirling about Pan-Pan’s entire body, keeping away the seawater as he shot forward at lightning speed.</p>
i t"""

soup = BeautifulSoup(data, 'lxml')


for x in soup.find_all('p', {'class':'calibre1'}):

    link = x.find('a')
    title = x.text
    corrected_title = soup.new_tag('h2')
    corrected_title.append(title)

    if link:
        x.string=''
        corrected_title = soup.new_tag('h2')
        corrected_title.append(title)
        link.append(corrected_title)
        x.append(link)

print(soup.body)

输出

<body>
    <p class="calibre1">
        <a id="p1">
            <h2>Chapter 370: Slamming straight on</h2>
        </a>
    </p>
    <p class="softbreak"> </p>
    <p class="calibre1">Hearing Yan Zhaoge’s suggestion, the Jade Sea City martial practitioners here were all stunned.</p>
    <p class="calibre1">
        <a id="p7">
            <h2>Chapter 372: Yan Zhaoge’s plan</h2>
        </a>
    </p>
    <p class="softbreak"> </p>
    <p class="calibre1">Yan Zhaoge and Ah Hu sat on Pan-Pan’s back, black water swirling about Pan-Pan’s entire body, keeping away the seawater as he shot forward at lightning speed.</p>
    i t
</body>

相关问题 更多 >

    编程相关推荐

    热门问题