Finding multiple occurrences of a string within a string in Python [duplicate]

by

Using regular expressions, you can use re.finditer to find all (non-overlapping) occurences:

>>> import re
>>> text="Allowed Hello Hollow"
>>> for m in re.finditer('ll', text):
         print('ll found', m.start(), m.end())

ll found 1 3
ll found 10 12
ll found 16 18

Alternatively, if you don’t want the overhead of regular expressions, you can also repeatedly use str.find to get the next index:

>>> text="Allowed Hello Hollow"
>>> index = 0
>>> while index < len(text):
        index = text.find('ll', index)
        if index == -1:
            break
        print('ll found at', index)
        index += 2 # +2 because len('ll') == 2

ll found at  1
ll found at  10
ll found at  16

This also works for lists and other sequences.

More Related Contents:

  1. Convert a String representation of a Dictionary to a dictionary?
  2. How do I put a variable’s value inside a string?
  3. Python string interning
  4. How can I remove the ANSI escape sequences from a string in python
  5. Python: TypeError: cannot concatenate ‘str’ and ‘int’ objects [duplicate]
  6. Python strings and integer concatenation [duplicate]
  7. How to write to a CSV line by line?
  8. Pandas column access w/column names containing spaces
  9. Remove characters except digits from string using Python?
  10. Remove quotes from String in Python
  11. Find longest repetitive sequence in a string
  12. Extract Number from String in Python
  13. Check if string has date, any format
  14. How do I split a string into a list of characters?
  15. Short rot13 function – Python [closed]
  16. Splitting on last delimiter in Python string?
  17. casting raw strings python [duplicate]
  18. Printing without newline (print ‘a’,) prints a space, how to remove?
  19. Why is True returned when checking if an empty string is in another?
  20. Replace first occurrence only of a string?
  21. Convert string to list. Python [string.split() acting weird]
  22. Remove final character from string
  23. How to find out if a Python object is a string?
  24. How do I create a multiline Python string with inline variables?
  25. What does ‘u’ mean in a list?
  26. Why doesn’t calling a string method (such as .replace) modify (mutate) the string? Why doesn’t it change unless I assign the result?
  27. How can I interleave or create unique permutations of two strings (without recursion)
  28. How to split a string within a list to create key-value pairs in Python
  29. How does str(list) work?
  30. How to remove all integer values from a list in python

Leave a Comment