The code then uses an if statement to check if a match was found.The re.search() method returns a match object if there is a match between the substring and the input string, otherwise it returns None.The code then uses the re.search() method to find a match between the substring and the input string. The input string is “I live in USA” and the substring we want to search for is “in”.The first line import re imports the re module which provides functions for pattern matching in strings.The code above is checking if a given substring is present in a string using regular expressions (regex). # If no match was found, print a failure message # If a match was found, print a success message # Use the search() method from the re module to find a match The re ( regular expression) module provides powerful methods for matching and searching for substrings in a string. Read: Append to a string Python + Examples Method-4: Using the re module Python find substring in string using the index method If the substring is not found, a ValueError is raised, which is caught by the except block, and a message indicating that the substring was not found is printed. If the substring is found, the code prints a message indicating the index of the substring in the string. The index() method is used to find the index of the substring in the string.The code uses a try-except block to handle the potential error of not finding the substring in the string.The input string is “I live in USA” and the substring we want to search for is “live”.The code above is checking if a given substring is present in a string. # If the substring is not found, print a message indicating that it was not found # Print a success message with the index of the substring # Find the index of the substring in the string using the index() method # Use try-except block to handle potential ValueError if substring is not found The index() method is similar to the find() method, but it raises a ValueError exception if the substring is not found in the string. Read: Convert string to float in Python Method-3: Using the index() method Python find substring in string using the find method If the index is equal to -1, the substring was not found and the code outputs “Substring not found”.If it is not, the substring was found and the code outputs “Substring found at index” followed by the value of the index. The code then checks if index is not equal to -1.If the substring is not found, index will be set to -1. If the substring is found, the index will be set to the index of the first character of the substring in the string.The find() method is used to search for the index of the substring in the string, and the result is stored in the variable index. The above code uses the find() method to search for the index of a given substring in a given string. # Use the find() method to get the index of the substring If the substring is not found, it returns -1. It returns the index of the first occurrence of the substring in the string. The find() method is another simple way to find substrings in a string. Read: Slicing string in Python + Examples Method-2: Using The find() method Python find substring in string using the in operator If not, the code outputs “Substring not found”. If it is, the code outputs “Substring found” to the console. The code uses the in operator to check if the substring is present in the string.The main string is stored in the variable string and the substring to be searched is stored in the variable substring.The above code checks if a given substring is present in a given string. # Use 'in' operator to check if substring is present in string It returns True if the substring is found and False otherwise. The in operator is one of the simplest and quickest ways to check if a substring is present in a string.
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