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我有以下输入字符串

input= """href="http://www.sciencedirect.com/science/article/pii/S0167923609002097" onmousedown="return scife_clk(this.href,'','res','2')">Using <b>text mining </b>and sentiment analysis for online forums hotspot detection and forecast</a></h3><div class="gs_a">N Li, <a href="/citations?
    href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309177/" onmousedown="return scife_clk(this.href,'ggp','res','1')">How to link ontologies and protein–protein interactions to literature: <b>text</b>-<b>mining </b>approaches and the BioCreative experience</a></h3><div class="gs_a"><a href="/citations?
    href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309177/" onmousedown="return scife_clk(this.href,'gga','gga','1')"><span class="gs_ggsL"><span class=gs_ctg2>[HTML]</span> from nih.gov</span><span class="gs_ggsS">nih.gov <span """

我想从中提取以下输出：

>> Using <b>text mining </b>and sentiment analysis for online forums hotspot detection and forecast
>> How to link ontologies and protein–protein interactions to literature: <b>text</b>-<b>mining </b>approaches and the BioCreative experience

我正在尝试在 python 中使用 re 包，但我不清楚要使用什么正则表达式，因为有几种模式，例如：

(this.href,'','res','2')"> or (this.href,'ggp','res','2')"> or (this.href,'gga','gga','2')">

我正在使用这个正则表达式：

=re.search(r"(this.href,'ggp.?','res','.?/D')"

但这对我不起作用。谁能告诉我要使用什么？

4

2 回答 2

1

这适用于您的示例：

input= """\
href="http://www.sciencedirect.com/science/article/pii/S0167923609002097" onmousedown="return scife_clk(this.href,'','res','2')">Using <b>text mining </b>and sentiment analysis for online forums hotspot detection and forecast</a></h3><div class="gs_a">N Li, <a href="/citations?
href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309177/" onmousedown="return scife_clk(this.href,'ggp','res','1')">How to link ontologies and protein–protein interactions to literature: <b>text</b>-<b>mining </b>approaches and the BioCreative experience</a></h3><div class="gs_a"><a href="/citations?
href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309177/" onmousedown="return scife_clk(this.href,'gga','gga','1')"><span class="gs_ggsL"><span class=gs_ctg2>[HTML]</span> from nih.gov</span><span class="gs_ggsS">nih.gov <span """

import re

for line in input.splitlines():
    m=re.search(r'onmousedown=.*?">(.*)</a>',line)
    if m:
        print(m.group(1))

印刷：

Using <b>text mining </b>and sentiment analysis for online forums hotspot detection and forecast
How to link ontologies and protein–protein interactions to literature: <b>text</b>-<b>mining </b>approaches and the BioCreative experience

请记住，将正则表达式与 HTML 一起使用可能是一个雷区（或思维场！），通常建议使用解析器。但是使用片段，你可以让它工作......

于 2013-04-15T16:02:38.043 回答
1

使用一个像样的 HTML 解析器会好得多。以 BeautifulSoup为例：

from bs4 import BeautifulSoup

soup = BeautifulSoup(input)

for link in soup.find_all('a', onmousedown=True):
    print link.text

它查找<a>具有onmousedown属性的所有元素。

于 2013-04-15T16:03:44.487 回答