Python Regex — Program for accepting a line starting with a vowel

Python Methods and Functions | Regular Expressions

For a given line, write a Python program to check if the given line starts with Vowel or not.

Examples :

  Input :  animal  Output:  Accepted  Input:  zebra  Output:  Not Accepted 

In this program we use the search () module re .

re.search() : This method returns None (if the pattern does not match) or re.MatchObject which contains information about the matching part of the string. This method stops after the first match, so it is better suited for validating regular expressions than retrieving data.

Let's take a look at a Python program to do this:

# Python program to accept a line starting with a vowel

 
# import re module

 
# re module provides support
# for regular expressions

import re

 
# Make a regular expression
# accept a line starting with a vowel

regex = ' ^ [aeiouAEIOU] [A-Za-z0-9 _] * '

  
# Define a function for
# accepts a line starting with a vowel

def check (string): 

  

# pass regex

# and a string in the search () method

  if (re.search (regex, string)): 

print ( " Valid "

 

  else

print ( " Invalid "

 

 
Driver code

if __ name__ = = '__main__'

 

# Enter a string

string = " ankit "

  

  # function call run

check (string)

  

  string = "geeks"

check (string )

 

string = " sandeep "

  check (string)

Exit:

 Valid Invalid Invalid 




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