Skip to content
Related Articles

Related Articles

Improve Article

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

 

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course




My Personal Notes arrow_drop_up
Recommended Articles
Page :