check if correct identifier in python

1# Python program to identify the identifier 
2  
3# import re module 
4  
5# re module provides support 
6# for regular expressions 
7import re 
8  
9# Make a regular expression 
10# for identify valid identifier 
11regex = '^[A-Za-z_][A-Za-z0-9_]*'
12      
13# Define a function for 
14# identifying valid identifier 
15def check(string):  
16  
17     # pass the regualar expression 
18     # and the string in search() method 
19    if(re.search(regex, string)):  
20        print("Valid Identifier")  
21          
22    else:  
23        print("Invalid Identifier")  
24      
25  
26# Driver Code  
27if __name__ == '__main__' :  
28      
29    # Enter the string  
30    string = input("Enter you Identifier\n")
31    # calling run function  
32    check(string)