String manipulation — a very important task in day to day programming and web development. Most of the requests and responses in HTTP requests are presented as strings with sometimes useless data that we need to delete. Let’s discuss some Pythonic ways to remove all characters except numbers and alphabets.
Method # 1: Using re.sub
| # Python code for demos
# remove all characters
# except numbers and alphabets import re
# initialization string ini_string = " 123abcjw :,. @! eiw "
# print the original line print ( "initial string:" , ini_string)
# function for demonstrations of removing characters
# which are not numbers and alphabets using re result = re.sub ( ’[W _] +’ , ’’, ini_string)
# print the final line print ( "final string" , result) |
Exit:
initial string: 123abcjw :,. @! eiw final string 123abcjweiw
Method # 2: Using isnumeric ()
| # Python code for demonstration
# remove all characters
# except numbers and alphabets import re
# initializing string ini_string = "123abcjw :,. @! eiw "
# print the original line print ( " initial string: " , ini_string)
# function to demonstrate removal of characters
# which are not numbers and alphabets using re getVals = list ( [val for val in ini_string if val .isalpha () or val.isnumeric ()]) result = " ". join (getVals)
# print the final line print ( "final string" , result) |
Exit:
initial string: 123abcjw :,. @! eiw final string 123abcjweiw
Method # 3: Using isalnum/ rel=noopener target=_blank> alnum ()
| # Python code for demo
# remove all characters
# except numbers and alphabets
# initializing string ini_string = "123abcjw :,. @! eiw"
# print the original line print ( "initial string:" , ini_string)
# function to demonstrate removal of characters
# which are not numbers and alphabets using re getVals = list ([val for val in ini_string if val.isalnum ()]) result = "". join (getVals)
# print the final line print ( "final string" , result ) |
Exit:
initial string : 123abc jw :,. @! eiw final string 123abcjweiw
