Hello everyone,
I recently came across the need to count all the occurrences of a pattern
inside a String. First, I used `String.split(string, pattern)` and then
counted the number of parts (-1). Then it was suggested to me to use
`:binary.matches` instead and simply count the number of entries. This is
quite straightforward, but you need to know about `:binary.matches`, so I
wondered if the Elixir `String` module should include something like
`String.count/2` instead:
@doc ~S"""
Counts the number of occurrences of a pattern in a string.
## Examples
iex> String.count("hello world", "o")
2
iex> String.count("hello world", "l")
3
iex> String.count("hello world", "x")
0
"""
@spec count(t, pattern) :: non_neg_integer
@doc since: "1.19.0"
def count(string, pattern) do
Enum.count(:binary.matches(string, pattern))
end
As you can see, the implementation is quite straightforward, so I'm not
sure if it's worth to be included. Let me know what you think!
Happy to send a PR.
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