Python Code To Check If String Contains Substring

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# Using the in keyword:

main_string = "Hello, World!"
substring = "World"

if substring in main_string:
    print("Substring found")
else:
    print("Substring not found")


#Using the str.find() method:

main_string = "Hello, World!"
substring = "World"

if main_string.find(substring) != -1:
    print("Substring found")
else:
    print("Substring not found")

#Using the str.index() method (similar to str.find() but raises an exception if the substring is not found):

main_string = "Hello, World!"
substring = "World"

try:
    index = main_string.index(substring)
    print("Substring found at index:", index)
except ValueError:
    print("Substring not found")

#Using regular expressions (requires the re module):

import re

main_string = "Hello, World!"
substring = "World"

if re.search(substring, main_string):
    print("Substring found")
else:
    print("Substring not found")


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