Python Regular Expression example

Question

I want to write a simple regular expression in Python that extracts a number from HTML. The HTML sample is as follows:

Your number is 123
         


        

Answer 1

import re
found = re.search("your number is <b>(\d+)</b>", "something.... Your number is <b>123</b> something...")

if found:
    print found.group()[0]

Here (\d+) is the grouping, since there is only one group [0] is used. When there are several groupings [grouping index] should be used.

Answer 2

import re
m = re.search("Your number is <b>(\d+)</b>",
      "xxx Your number is <b>123</b>  fdjsk")
if m:
    print m.groups()[0]

Answer 3

import re
x = 'Your number is <b>123</b>'
re.search('(?<=Your number is )<b>(\d+)</b>',x).group(0)

this searches for the number that follows the 'Your number is' string

Answer 4

import re
print re.search(r'(\d+)', 'Your number is <b>123</b>').group(0)

Answer 5

To extract as python list you can use findall

>>> import re
>>> string = 'Your number is <b>123</b>'
>>> pattern = '\d+'
>>> re.findall(pattern,string)
['123']
>>>

Answer 6

You can use the following example to solve your problem:

import re

search = re.search(r"\d+",text).group(0) #returns the number that is matched in the text

print("Starting Index Of Digit", search.start())

print("Ending Index Of Digit:", search.end())