It will return the number of occurrences of a substring in the given string. It is case sensitive
String.count(value, start, end)
#String- Value from where the substring needs to be searched
#value - It is a substring that needs to be searched in the given String.
#start - (Optional) It is a position to start the search, by default is 0
#end - (Optional) It is a position to end search,
by default is the end of the string