Python正则表达式忽略新行

Question

我的网页是这样的

<td valign="top">

    <table width="100%" border="0" cellspacing="2" cellpadding="1" class="main_tb3">
        <tr>
            <td colspan="2">
                <div align="center">
                <a href="/title/name.php" target="_blank">
                <img src="./movie/image.jpg" alt="TitleName" border="0" height="100" width="225" />
                </a>
                </div>
            </td>
        </tr>
        <tr>
            <td colspan="2"><h1 align="center"><a href="./title.php?titleid=12">Title - secondname</a></h1></td>
        </tr>
        <tr>
            <td><span class="style10">Cat1 :</span></td>
            <td>1st name</td>
        </tr>
        <tr>
            <td width="32%"><span class="style10">Cat2 :</span></td>
            <td width="68%"><b><i><a href="./secondname.php" target="_blank">secondname</a></i></b></td>
        </tr>
        <tr>
            <td><span class="style10">cat4 :</span></td>
            <td>Bla bla</td>
        </tr>
        <tr>
            <td><span class="style10">Cat3 :</span></td>
            <td>thirdName2</td>
        </tr>
    </table>

</td>
<td valign="top">

    <table width="100%" border="0" cellspacing="2" cellpadding="1" class="main_tb3">
        <tr>
            <td colspan="2">
                <div align="center">
                <a href="/title/name.php" target="_blank">
                <img src="./movie/image.jpg" alt="TitleName" border="0" height="100" width="225" />
                </a>
                </div>
            </td>
        </tr>
        <tr>
            <td colspan="2"><h1 align="center"><a href="./title.php?titleid=12">Title - secondname</a></h1></td>
        </tr>
        <tr>
            <td><span class="style10">Cat1 :</span></td>
            <td>1st name</td>
        </tr>
        <tr>
            <td width="32%"><span class="style10">Cat2 :</span></td>
            <td width="68%"><b><i><a href="./secondname.php" target="_blank">secondname</a></i></b></td>
        </tr>
        <tr>
            <td><span class="style10">cat4 :</span></td>
            <td>Bla bla</td>
        </tr>
        <tr>
            <td><span class="style10">Cat3 :</span></td>
            <td>thirdName2</td>
        </tr>
    </table>

</td>

我想使用 python 正则表达式从该站点获取某些值。 在<div align="center"> 之后，我喜欢从<h1 align="center"><a href="./title.php?titleid=12">Title - secondname</a></h1> 获取href 值：“/title/name.php”和img src：“./movie/image.jpg”和Title - secondname

我试过这个： regex = 'class="main_tb3"*\n<a href="(.+?)" target="_blank">\n<img src="(.+?)"'

请帮帮我

Answer 1

你可以使用下面的正则表达式

对于href值：<a href="(.*?)"

图片来源：<img src="(.*?)"

标题：titleid=12">(.*?)<

Answer 2

您会发现安装 BeautifulSoup 之类的东西要简单得多：

from bs4 import BeautifulSoup

html = """
<td valign="top">

    <table width="100%" border="0" cellspacing="2" cellpadding="1" class="main_tb3">
        <tr>
            <td colspan="2">
                <div align="center">
                <a href="/title/name.php" target="_blank">
                <img src="./movie/image.jpg" alt="TitleName" border="0" height="100" width="225" />
                </a>
                </div>
            </td>
        </tr>
        <tr>
            <td colspan="2"><h1 align="center"><a href="./title.php?titleid=12">Title - secondname</a></h1></td>
        </tr>
        <tr>
            <td><span class="style10">Cat1 :</span></td>
            <td>1st name</td>
        </tr>
        <tr>
            <td width="32%"><span class="style10">Cat2 :</span></td>
            <td width="68%"><b><i><a href="./secondname.php" target="_blank">secondname</a></i></b></td>
        </tr>
        <tr>
            <td><span class="style10">cat4 :</span></td>
            <td>Bla bla</td>
        </tr>
        <tr>
            <td><span class="style10">Cat3 :</span></td>
            <td>thirdName2</td>
        </tr>
    </table>

</td>
<td valign="top">

    <table width="100%" border="0" cellspacing="2" cellpadding="1" class="main_tb3">
        <tr>
            <td colspan="2">
                <div align="center">
                <a href="/title/name.php" target="_blank">
                <img src="./movie/image.jpg" alt="TitleName" border="0" height="100" width="225" />
                </a>
                </div>
            </td>
        </tr>
        <tr>
            <td colspan="2"><h1 align="center"><a href="./title.php?titleid=12">Title - secondname</a></h1></td>
        </tr>
        <tr>
            <td><span class="style10">Cat1 :</span></td>
            <td>1st name</td>
        </tr>
        <tr>
            <td width="32%"><span class="style10">Cat2 :</span></td>
            <td width="68%"><b><i><a href="./secondname.php" target="_blank">secondname</a></i></b></td>
        </tr>
        <tr>
            <td><span class="style10">cat4 :</span></td>
            <td>Bla bla</td>
        </tr>
        <tr>
            <td><span class="style10">Cat3 :</span></td>
            <td>thirdName2</td>
        </tr>
    </table>

</td>"""

soup = BeautifulSoup(html)

for table in soup.find_all("table", class_="main_tb3"):
    print table.find('a').get('href')
    print table.find('h1').text

对于您提供的 HTML，这将打印以下内容：

/title/name.php
Title - secondname
/title/name.php
Title - secondname