Question

我有一些HTML，我想在其中找到包含逗号分隔数字的字符串，如

871,174次观看（这可能是1到n，其中有逗号）

我试过很多例如

'(\d+(,d+)*)\sViews'

但无法使其正常运行，因为我在运行时

re.findall(r'(\d+(,d+)*)\sViews', string)

，它给出了

[('174', '')]

其实我想得到这个号码。

编辑1：这是我传递给正则表达式的字符串

<span class="fcg"><span id="fbPhotoPageCreatorInfo"></span></span><div class="mbs fbPhotosAudienceContainerNotEditable" id="fbPhotoPageAudienceSelector"><span class="mrs fbPhotosAudienceNotEditable fsm fwn fcg">Shared with:</span><div class="_6a _29ee _3iio _20nn _43_1" data-hover="tooltip" aria-label="Public" data-tooltip-alignh="center"><i class="img sp_e0NUBoHLxu_ sx_9486cc"></i><span class="_29ef">Public</span></div>&nbsp;</div><div></div><span class="fcg">871,174 Views</span>

Answer 1

除非是拼写错误，否则你省略了反斜杠：

  '(\d+)(,\d+)*\sViews'
# here __^

<强>测试

>>> html = """<span class="fcg">871,174 Views</span>"""
>>> import re
>>> pattern = re.compile(r'(\d+)(?:,(\d+))*\sViews')
>>> matches = re.findall(pattern, html)
>>> print(matches)
[('871', '174')]

Answer 2

(\d+(?:,d+)*)

试试这个。这应该适合你。

Answer 3

如果您不想使用BeautifulSoup获取文本并且要使用重新搜索整个字符串，那么如果您担心速度的话，rsplit会更快：

html = """<span class="fcg"><span id="fbPhotoPageCreatorInfo"></span></span><div class="mbs fbPhotosAudienceContainerNotEditable" id="fbPhotoPageAudienceSelector"><span class="mrs fbPhotosAudienceNotEditable fsm fwn fcg">Shared with:</span><div class="_6a _29ee _3iio _20nn _43_1" data-hover="tooltip" aria-label="Public" data-tooltip-alignh="center"><i class="img sp_e0NUBoHLxu_ sx_9486cc"></i><span class="_29ef">Public</span></div>&nbsp;</div><div></div><span class="fcg">871,174 Views</span>"""

import re
print(re.findall(("\d+"),html.rsplit('class="fcg">',1)[1]))
['871', '174']

In [13]: timeit re.findall(("\d+"),html.rsplit('class="fcg">',1)[1])
100000 loops, best of 3: 3.21 µs per loop

In [14]: timeit matches = re.findall(pattern, html)
10000 loops, best of 3: 20.1 µs per loop

与任何正则表达式相比，这种破坏的可能性大致相同，这就是为什么你应该使用beautifulSoup。

Answer 4

import re

html = """<span class="fcg"><span id="fbPhotoPageCreatorInfo"></span></span><div class="mbs fbPhotosAudienceContainerNotEditable" id="fbPhotoPageAudienceSelector"><span class="mrs fbPhotosAudienceNotEditable fsm fwn fcg">Shared with:</span><div class="_6a _29ee _3iio _20nn _43_1" data-hover="tooltip" aria-label="Public" data-tooltip-alignh="center"><i class="img sp_e0NUBoHLxu_ sx_9486cc"></i><span class="_29ef">Public</span></div>&nbsp;</div><div></div><span class="fcg">871,174 Views</span>"""

p = re.compile(r"[\d\,]+(?=\sViews)")
print p.findall(html)

正则表达式查找逗号分隔数字python

4 个答案: