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Python Find All Indexes Of Character In String

Last Updated : Mar 11, 2024

Python Find All Indexes Of Character In String

In this article we will show you the solution of python find all indexes of character in string, list comprehensions are another tool we can utilise to fix our issue.

List comprehensions are tools for building new lists from existing ones.

Each character in the string variable can be iterated through using list comprehensions, which will return that index if the character meets the one we're looking for.

So let's talk about the Python locate all character indexes in string notion.

Step By Step Guide On Python Find All Indexes Of Character In String :-

Method - Python's regular expressions:

import re
string = "This is a string"
char = "s"
indices = [s.start() for s in re.finditer(char, string)]
print(indices)
  1. As you can see, we use regular expressions to build the Python code to discover all character indexes in a string.
  2. For our particular issue, we can make use of Python's finditer() function, which is part of the re module.
  3. The pattern as well as the string are both required inputs for the finditer() method.
  4. It returns every index where the pattern appears after reading the string right to left.
  5. This function can be combined with list comprehensions in Python to store the outcome inside a list.
  6. We iterated through every character in the string using the re.finditer() method to locate every character that matched the character char.
  7. We created a list and stored it inside indices, returning a index i.start() of each character that matched char.
  8. By using the print function, we were able to display all of the index elements in the end.

Method - Using the word "yield"

def find(string, char):
    for s, c in enumerate(string):
        if c == char:
            yield s
string = "This is a string"
char = "s"
indices = list(find(string, char))
print(indices)
  1. As you can see, we created a Python programme to locate all character indexes in a string.
  2. To address our particular issue, the yield keyword can also be used inside a function.
  3. Several values can be returned from a function using the yield keyword without changing the state of a function's local variables.
  4. A previous yield statement is used as the starting point for execution when the function is invoked once again.
  5. You can use this expression to track down every instance of a specific character within a string.
  6. We created the function find(string, char), which iterates through each letter in the string and returns the index I if a character matches char.
  7. We kept all of the returned values from the find() method in a list while calling it.
  8. Then, using Python's print function, we displayed every entry of the list.

Conclusion :-

As a result, we were able to understand the concept of finding all character indexes in a string in Python.

List comprehensions return values that take the shape of lists, as well, which is something else we learned.

These index values can be kept in a list, and the outcomes can be shown.

I hope this article on python find all indexes of character in string helps you and the steps and method mentioned above are easy to follow and implement.