How to use regex to parse a number from HTML?
PythonRegexPython Problem Overview
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 <b>123</b>
Now, how can I extract "123", i.e. the contents of the first bold text after the string "Your number is"?
Python Solutions
Solution 1 - Python
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]
Solution 2 - Python
Given s = "Your number is <b>123</b>" then:
import re
m = re.search(r"\d+", s)
will work and give you
m.group()
'123'
The regular expression looks for 1 or more consecutive digits in your string.
Note that in this specific case we knew that there would be a numeric sequence, otherwise you would have to test the return value of re.search() to make sure that m contained a valid reference, otherwise m.group() would result in a AttributeError: exception.
Of course if you are going to process a lot of HTML you want to take a serious look at BeautifulSoup - it's meant for that and much more. The whole idea with BeautifulSoup is to avoid "manual" parsing using string ops or regular expressions.
Solution 3 - Python
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
Solution 4 - Python
import re
print re.search(r'(\d+)', 'Your number is <b>123</b>').group(0)
Solution 5 - Python
The simplest way is just extract digit(number)
re.search(r"\d+",text)
Solution 6 - Python
val="Your number is <b>123</b>"
###Option : 1 m=re.search(r'(<.?>)(\d+)(<.?>)',val)
m.group(2)
###Option : 2
re.sub(r'([\s\S]+)(<.*?>)(\d+)(<.*?>)',r'\3',val)
Solution 7 - Python
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.
Solution 8 - Python
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']
>>>
Solution 9 - Python
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())
Solution 10 - Python
import re
x = 'Your number is <b>123</b>'
output = re.search('(?<=Your number is )<b>(\d+)</b>',x).group(1)
print(output)