Python: Find a string contains a vowel between two consonants, in a given string

Last update on May 30 2025 11:50:17 (UTC/GMT +8 hours)

Vowel Between Consonants Substring

Write a Python program to find a substring in a given string that contains a vowel between two consonants.

From vocabulary.com:
A consonant is a speech sound that is not a vowel. It also refers to letters of the alphabet that represent those sounds: Z, B, T, G, and H are all consonants. Consonants are all the non-vowel sounds, or their corresponding letters: A, E, I, O, U and sometimes Y are not consonants.

Input: Hello
Output:
Hel

Input: Sandwhich
Output:
San

Input: Python
Output:
hon

Visual Presentation:

Sample Solution:

Python Code:

# License: https://bit.ly/3oLErEI

# Define a function named 'test' that takes a string as input
def test(s):
    cons = "bcdfghjklmnpqrstvwxz"  # Define a string containing consonants
    vows = "aeiou"  # Define a string containing vowels
    
    # Use a generator expression to find a vowel between two consonants in the string
    return next(s[i - 1:i + 2] for i in range(1, len(s) - 1)
                if s[i].lower() in vows and s[i - 1].lower() in cons and s[i + 1].lower() in cons)

# Example 1
strs1 = "Hello"
print("Original string:", strs1)
print("Find a vowel between two consonants, contained in said string:")
print(test(strs1))

# Example 2
strs2 = "Sandwich"
print("\nOriginal string:", strs2)
print("Find a vowel between two consonants, contained in said string:")
print(test(strs2))

# Example 3
strs3 = "Python"
print("\nOriginal string:", strs3)
print("Find a vowel between two consonants, contained in said string:")
print(test(strs3))

Sample Output:

Original string: Hello
Find a vowel between two consonants, contained in said string:
Hel

Original string: Sandwhich
Find a vowel between two consonants, contained in said string:
San

Original string: Python
Find a vowel between two consonants, contained in said string:
hon

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to find the first substring of length three in which the middle character is a vowel and the others are consonants.
• Write a Python program to use a sliding window of size 3 over a string and return the first instance where a vowel is flanked by consonants.
• Write a Python program to use regular expressions to extract a substring that matches a consonant-vowel-consonant pattern.
• Write a Python program to iterate over the string and identify the first triplet that meets the vowel between consonants criterion.

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Python Code Editor :

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