从 HTML 文档中提取 IP 地址 [英] Extract IP address from HTML document

问题描述

如何打印下一行的 IP 地址 (86.23.215.130)?整个文件(未显示)是来自 wget(因此是 HTML)的标准输出.听起来很简单，但我没有做到.

How can I print the IP address (86.23.215.130) of the following line? The entire file (not shown) is the stdout from a wget (hence HTML). Sounds easy, but I didn't manage.

...
<tr><td align=center colspan=3 bgcolor="D0D0D0"><font face="Arial, Monospace" size=+3>86.23.215.130</font></td></tr>
...

谢谢

推荐答案

为什么使用 sed?我相信 grep 好多了:

Why sed? I believe grep is much better:

grep -iohP '(?<=\x3e)([0-9]+\.){3}[0-9]+(?=\x3c)' file

其中 \x3e 表示 > 而 \x3c 表示 <(ascii 十六进制代码)

where \x3e means > and \x3c means < (ascii hex code)

虽然 sed 可以做到这一点，但不推荐:

Although sed can do this, but it's not recommended:

sed -rn 's/.*\x3e(([0-9]+\.){3}[0-9]+)\x3c.*/\1/p' file

感谢 Sternad 先生，我改进了一点.

Thanks to Mr. Sternad, I improved this a little bit.

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