Python Program to Check if a Substring is Present in a Given String

Strings in Python:

“String is a character collection or array”

Well in Python too, for the string data type, we say the same definition. The string is a sequenced character array and is written within single, double, or three quotes. Also, Python does not have the data type character, thus it is used as a string of length 1 if we write ‘V’.

Substring in Python:

A substring in Python is a sequence of characters within another string. It is also known as string slicing in Python.

Given a string and substring, the task is to check whether the given substring exists in the given string or not in Python

Examples:

Example1:

Input:

given string = hello this is BTechgeeks 
given substring = BTechgeeks

Output:

The substring [ BTechgeeks ] is found in [ hello this is BTechgeeks ]

Example2:

Input:

given string = good morning virat
given substring = morning

Output:

The substring [ morning ] is found in [ good morning virat ]

Program to Check if a Substring is Present in a Given String in Python

There are several ways to check if the given substring exists in a given string or not in Python some of them are:

Using find() function (Static Input)
Using find() function (User Input)
Using in operator (Static Input)
Using in operator (User Input)

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Method #1:Using find() function (Static Input)

Approach:

Give string and substring as static input and store them in two separate variables.
Using the in-built find() method, determine whether the substring exists in the given string.
If the find() function returns -1 then the given substring isn’t found in the given string.
Else the given substring is found in the given string
The Exit of the program.

Below is the implementation:

# Give string and substring as static input and store them in two separate variables
given_strng = 'hello this is BTechgeeks'
# given substring
given_substring = 'BTechgeeks'
# Using the in-built find() method, determine
# whether the substring exists in the given string.
# If the find() function returns -1 then the given substring isn't found in the given string.
if(given_strng.find(given_substring) == -1):
    print('The substring [', given_substring,
          '] is not found in [', given_strng, ']')
else:
    print('The substring [', given_substring,
          '] is found in [', given_strng, ']')

Output:

The substring [ BTechgeeks ] is found in [ hello this is BTechgeeks ]

Method #2:Using find() function (User Input)

Approach:

Give string and substring as user input using input() function and store them in two separate variables.
Using the in-built find() method, determine whether the substring exists in the given string.
If the find() function returns -1 then the given substring isn’t found in the given string.
Else the given substring is found in the given string
The Exit of the program.

Below is the implementation:

# Give string and substring as user input using input() function
# and store them in two separate variables.
given_strng = input('Enter some random string = ')
# given substring
given_substring = input('Enter some random substring = ')
# Using the in-built find() method, determine
# whether the substring exists in the given string.
# If the find() function returns -1 then the given substring isn't found in the given string.
if(given_strng.find(given_substring) == -1):
    print('The substring [', given_substring,
          '] is not found in [', given_strng, ']')
else:
    print('The substring [', given_substring,
          '] is found in [', given_strng, ']')

Output:

Enter some random string = good morning virat
Enter some random substring = morning
The substring [ morning ] is found in [ good morning virat ]

Explanation:

A string and a substring from the user must be entered and stored in separate variables.
The in-built method find() is then used to see if the substring is present in the string.
The decision is made using an if statement, and the final result is printed.

Method #3:Using in operator (Static Input)

Approach:

Give string and substring as static input and store them in two separate variables.
Using the in operator, determine whether the substring exists in the given string.
If it returns true, then the given substring is found in the given string.
Else the given substring isn’t found in the given string
The Exit of the program.

Below is the implementation:

# Give string and substring as static input and store them in two separate variables.
given_strng = 'hello this is BTechgeeks'
# given substring
given_substring = 'BTechgeeks'
# Using the in operator, determine whether the substring exists in the given string
# If it returns true, then the given substring is found in the given string.
if given_substring in given_strng:
    print('The substring [', given_substring,
          '] is  found in [', given_strng, ']')
# Else the given substring isn't found in the given string
else:
    print('The substring [', given_substring,
          '] is not found in [', given_strng, ']')

Output:

The substring [ BTechgeeks ] is  found in [ hello this is BTechgeeks ]

Method #4:Using in operator (User Input)

Approach:

Give string and substring as user input using input() function and store them in two separate variables.
Using the in operator, determine whether the substring exists in the given string.
If it returns true, then the given substring is found in the given string.
Else the given substring isn’t found in the given string
The Exit of the program.

Below is the implementation:

# Give string and substring as user input using input() function
# and store them in two separate variables.
given_strng = input('Enter some random string = ')
# given substring
given_substring = input('Enter some random substring = ')
# Using the in operator, determine whether the substring exists in the given string
# If it returns true, then the given substring is found in the given string.
if given_substring in given_strng:
    print('The substring [', given_substring,
          '] is  found in [', given_strng, ']')
# Else the given substring isn't found in the given string
else:
    print('The substring [', given_substring,
          '] is not found in [', given_strng, ']')

Output:

Enter some random string = this is that
Enter some random substring = are
The substring [ are ] is not found in [ this is that ]

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