find findall

`find` and `findall` are functions commonly used in regular expressions. In Python, these functions are available in the `re` module.

The `find` function is used to search for a pattern in a string and returns the index of the first occurrence of the pattern. If the pattern is not found, it returns -1.

Example usage of `find`:

import re

text = "Hello, World!"
pattern = "World"

index = re.find(pattern, text)
print(index)  # output: 7

On the other hand, the `findall` function returns all non-overlapping occurrences of a pattern in a string as a list of strings.

Example usage of `findall`:

import re

text = "Hello, World! How are you?"
pattern = "\w+"

matches = re.findall(pattern, text)
print(matches)  # output: ['Hello', 'World', 'How', 'are', 'you']

In both cases, regular expressions are used to define the pattern to be searched for. Regular expressions provide a powerful and flexible way to match and manipulate strings.