Regular Expressions Matching and Extracting Data

https://www.youtube.com/embed/LaCZnTbQGkE

>>> import re
>>> x = 'What will search for a "$" in a regular expression?'
>>> y = re.findall('[0-9]+',x)
>>> print(y)
[]

y = re.findall('[0-9]+',x) find every character in x and keep or remember only the digit 0 - 9 might be one digit or more then print out only the digit.

>>> import re
>>> x = 'What will search for a "$" in a regular expression?'
>>> y = re.findall('[0-9]+',x)
>>> print (y)
[]
>>> y = re.findall('[AEIOU]+',x)
>>> print(y)
[]

y = re.findall('[AEIOU]+',x) find AEIOU in words in the x but just keep only upper latter

>>> import re
>>> x = 'Form: Using the : character'
>>> y = re.findall('^F.+:',x)
>>> print(y)
['Form: Using the :']

y = re.findall('^F.+:',x) find the words that start with F then follow by one or more character then end with :

import re
x = 'From: Using the : character'
y = re.findall('^F.+?:',x)
print (y)

Output

['From:']

y = re.findall('^F.+?:',x) find word start with F follow by one or more character but not greedy

Question

  • What will the following program print?:

      import re
  s = 'A message from csev@umich.edu to cwen@iupui.edu about meeting @2PM'
  lst = re.findall('\\S+@\\S+', s)
  print(lst)

  • Ans

      ['csev@umich.edu', 'cwen@iupui.edu']

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