regex - how to make the width and height x2 using python Regular

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regex - how to make the width and height x2 using python Regular

posted Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

regex - how to make the width and height x2 using python Regular

i have to do many work to change like this:

<img src = "/" height="111" width="10" />

to

<img src = "/" height="222" width="20" />

so i want to use python Regular this is my code :

import re

s = '<img src = "werwerwe" height="111" width="10" />'

def a(x):
    print x.group(2)
    print x.group(4)

ss = re.sub(r'''<img.*(widths*="?(d+)"?)*s*(heights*="?(d+)"?)*''',a, s)

print ss

so what can i do ,

thanks

updated:

it is ok now :

import re

s = '<img src = "/" height="111" width="10" />'


def a(x):
    b = x.group(0)
    b = b.replace(x.group(1),str(int(x.group(1))*2))
    b = b.replace(x.group(2),str(int(x.group(2))*2))
    return b

ss = re.sub(r'''<img.*?height="(d+)".*?width="(d+)"[^>]*>''',a, s)

print ss

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1 Reply

深蓝 · Answer 1 · 2022-01-31T07:26:49+0000

Don't use regular expressions to parse HTML. Use BeautifulSoup

>>> from BeautifulSoup import BeautifulSoup
>>> ht = '<html><head><title>foo</title></head><body><p>whatever: <img src="foo/img.png" height="111" width="22" /></p><ul><li><img src="foo/img2.png" height="32" width="44" /></li></ul></body></html>'
>>> soup = BeautifulSoup(ht)
>>> soup
<html><head><title>foo</title></head><body><p>whatever: <img src="foo/img.png" height="111" width="22" /></p><ul><li><img src="foo/img2.png" height="32" width="44" /></li></ul></body></html>
>>> soup.findAll('img')
[<img src="foo/img.png" height="111" width="22" />, <img src="foo/img2.png" height="32" width="44" />]
>>> for img in soup.findAll('img'):
...     ht = int(img['height'])
...     wi = int(img['width'])
...     img['height'] = str(ht * 2)
...     img['width'] = str(wi * 2)
...     
... 
>>> print soup.prettify()
<html>
 <head>
  <title>
   foo
  </title>
 </head>
 <body>
  <p>
   whatever:
   <img src="foo/img.png" height="222" width="44" />
  </p>
  <ul>
   <li>
    <img src="foo/img2.png" height="64" width="88" />
   </li>
  </ul>
 </body>
 </html>
>>>

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regex - how to make the width and height x2 using python Regular

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