python find index of element in string code example

Example 1: how to find the location of a character in a string in python

>>> myString = 'Position of a character'
>>> myString.find('s')
2
>>> myString.find('x')
-1

Example 2: python string indexof

s = "mouse"
animal_letter = s.find('s')
print animal_letter

Example 3: how to find the indexes of a substring in a string in python

import re
# matches_position_start will be a list of starting index positions
matches_start = re.finditer(word.lower(), string.lower())
matches_position_start = [match.start() for match in matches_start]

# matches_position_end will be a list of ending index positions
matches_end = re.finditer(word.lower(), string.lower())
matches_position_end = [match.end() for match in matches_end]