Python Regex – Program to accept string starting with vowel

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 :

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# 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 regualar 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)

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Output:

Valid
Invalid
Invalid


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