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This page documents a user-defined function that you can copy and paste into your addon. Replace PREFIX with your addon or lib prefix to avoid conflicts between different versions of these functions.

User defined functions

Return how many times needle is contained in haystack.

number = <PREFIX>_CountChars(haystack, needle)

Function Parameters[]

Arguments[]

haystack
String - The search subject.
needle
The string to look for. needle can be a regular expression ('[a-z%s%d]' will count all alphanumeric characters and white spaces)
Notes
Arguments are cast into strings before any processing is done.
The search is not case-sensitive.

Returns[]

number
Number of times needle is contained in haystack. If needle is not found, returns 0.


Example[]

number1 = <PREFIX>_CountChars("World of Warcraft", 'o')
number2 = <PREFIX>_CountChars("World of Warcraft", 'w[a-z]')
number3 = <PREFIX>_CountChars("World of Warcraft", 'r[a-z]')
number4 = <PREFIX>_CountChars("World of Warcraft", 'r[a-z][a-z]')

Result[]

number1 = 2
number2 = 2
number3 = 3
number4 = 3

Code[]

function <PREFIX>_CountChars (haystack, needle)
    haystack = strlower(tostring(haystack));
    needle = strlower(tostring(needle));
    local ret, pos = 0, 0
    for i = 1, strlen(haystack) do
        local s, e = strfind(haystack, needle, pos)
        if e then
            pos = e
            if s == e then
                pos = pos + 1
            end
        end
        if s and e then
            ret = ret + 1;
        else
            break -- If it hasn't found any more, there's no reason to continue
        end
    end
    return ret
end
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