Count occurrences of a char in a string using Bash

Question

I need to count the number of occurrences of a char in a string using Bash.

In the following example, when the char is (for example) t, it

Answer 1

I Would suggest the following:

var="any given string"
N=${#var}
G=${var//g/}
G=${#G}
(( G = N - G ))
echo "$G"

No call to any other program