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Python Regex – Program to accept string starting with vowel

  • Last Updated : 17 May, 2021
Geek Week

Prerequisite: Regular expression in Python
Given a string, write a Python program to check whether the given string is starting with Vowel or Not.
Examples: 
 

  
Input: animal
Output: Accepted

Input: zebra
Output: Not Accepted

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. 
Let’s see the Python program for this : 
 

Python3




# Python program to accept string starting with a vowel
 
# import re module
 
# re module provides support
# for regular expressions
import re
 
# Make a regular expression
# to accept string starting with vowel
regex = '^[aeiouAEIOU][A-Za-z0-9_]*'
     
# Define a function for
# accepting string start with vowel
def check(string):
 
     # pass the regular expression
     # and the string in search() method
    if(re.search(regex, string)):
        print("Valid")
         
    else:
        print("Invalid")
     
 
# Driver Code
if __name__ == '__main__' :
     
    # Enter the string
    string = "ankit"
     
    # calling run function
    check(string)
 
    string = "geeks"
    check(string)
 
    string = "sandeep"
    check(string)
Output: 
Valid
Invalid
Invalid

 

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