Find the Index of a Substring in Python

s = "GeeksforGeeks"
# Define the substring we want to find
s1 = "eeks"
# Use the find() method to locate the starting index of the substring 's1' in the string 's'
index = s.find(s1)
#Print either satarting position of 's1' or -1 if not found
print(index)

s = "GeeksforGeeks"
# Define the substring we want to find
s1 = "or"
try:
  #index() returns the starting position of 's1' in 's'
    index = s.index(s1)
    print(f"The substring '{s1}' is found at index {index}.")
except ValueError:
  ## If the substring is not found, the index() method raises a ValueError
    print(f"The substring '{s1}' is not present in the text.")

s = "Geeks for Geeks"
# Define the substring we want to find
s1 = "for"
parts = s.split(s1)
# Check if the substring is in the string
if len(parts) > 1:
    # Calculate the starting index of the substring
    index = len(parts[0]) 
    print(f"The substring '{s1}' is found at index {index}.")
else:
    print(f"The substring '{s1}' is not present in the text.")

import re
s = "hello world"
s1 = "ello"
# Use the re.search() function to search for the substring in the main string
match = re.search(s1, s)
if match:
  # If a match exists, print the starting index of the substring
    print(f"The substring '{s1}' is found at index {match.start()}")
else:
  # If no match is found, print that the substring is not present
    print(f"The substring '{s1}' is not present in the text")