count ( haystack , needle )
count ( haystack , needle , caseinsensitive)

Return the count of the string needle in the string haystack. You may also specify an optional boolean value caseinsensitive to specify that the search will treat upper and lower case letters the same.

print count("Hello", "lo")
print count("Buffalo buffalo buffalo.","BUFFALO",true)

will display

1
3

0.9.6.55