python re module

[Degenerate Tech]

i have a html text

video link starting after sd_src: key 

sd_src:"http//video.mp4"

i want to find video link from html text

how to do using re module in python?

 

[Elliot Garbus]

Here are some useful resources:

https://docs.python.org/3/howto/regex.html

 

An interactive tool for creating (and learning regex): https://regex101.com/

 

 

>>> import re

>>> p = re.compile(r'(sd_src:\s?)(\".+\")')

>>> m = p.match('sd_src:"http//video.mp4"')

>>> matches = m.groups()

>>> matches[1]

'"http//video.mp4"'

 

Explanation:  from the regex101 tool.

"

(sd_src:\s?)(\".+\")

"

gm

1st Capturing Group 

(sd_src:\s?)

sd_src: matches the characters sd_src: literally (case sensitive)

\s?

 matches any whitespace character (equal to [\r\n\t\f\v ])

? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)

2nd Capturing Group 

(\".+\")

\" matches the character " literally (case sensitive)

.+

 matches any character (except for line terminators)

+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)

\" matches the character " literally (case sensitive)

Global pattern flags

g modifier: global. All matches (don't return after first match)

m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

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[Degenerate Tech]

please see this ..it is not matching

import re 

p='hello this is line  ,sd_src:"https://video?=j.mp4"'

m=re.compile(r'(sd_src:\s?)(\".+\")')

v=m.match(p)

url=v.groups()

#url = re.search('sd_src:"https', )

#print(x)

print(url)

######

 Traceback (most recent call last):
  File "main.py", line 35, in <module>
    url=v.groups()
AttributeError: 'NoneType' object has no attribute 'groups'

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[Elliot Garbus]

See:

https://docs.python.org/3/howto/regex.html#performing-matches

 

use search instead of match,  match is for checking the re at the beginning of a string.

 

>>> string = 'hello this is line  ,sd_src:"https://video?=j.mp4"'

>>> m = re.compile(r'(sd_src:\s?)(\".+\")')

>>> result = m.search(string)

>>> url = result.groups()[1]

>>> url

'"https://video?=j.mp4"'

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