Python program to calculate the number of words and characters in the string

Python Regex | Program to accept string ending with alphanumeric character

Last Updated : 10 Jun, 2021

Prerequisite: Regular expression in Python
Given a string, write a Python program to check whether the given string is ending with only alphanumeric character or Not.
Examples:

Input: ankitrai326
Output: Accept

Input: ankirai@
Output: Discard

In this program, we are using search() method of re module.
re.search() : This method either returns None (if the pattern doesn’t match), or re.MatchObject that contains information about the matching part of the string. This method stops after the first match, so this is best suited for testing a regular expression more than extracting data.
Alphanumeric characters in the POSIX/C locale consist of either 36 case-insensitive symbols (A-Z and 0-9) or 62 case-sensitive characters (A-Z, a-z and 0-9).
Let’s see the Python program for this :

Python3

# Python program to accept string ending
# with only alphanumeric character.
# import re module
 
# re module provides support
# for regular expressions
import re
 
# Make a regular expression to accept string
# ending with alphanumeric character
regex = '[a-zA-z0-9]$'
     
# Define a function for accepting string
# ending with alphanumeric character
def check(string): 
 
     # pass the regular expression
     # and the string in search() method
    if(re.search(regex, string)): 
        print("Accept") 
         
    else: 
        print("Discard") 
     
 
# Driver Code 
if __name__ == '__main__' : 
     
    # Enter the string 
    string = "ankirai@"
     
    # calling run function 
    check(string)
 
    string = "ankitrai326"
    check(string)
 
    string = "ankit."
    check(string)
 
    string = "geeksforgeeks"
    check(string)

Output :

Discard
Accept
Discard
Accept

Python program to calculate the number of words and characters in the string

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