Retrieves a substring of this instance.
The substring starts at a specified character position and has a specified length.
_string | String to extract from [String] |
_startIndex | Index to start the substring extraction [Number] |
_length | length of the extracted substring [Number](Optional) if is not set than from _startIndex to end |
String extracted [String]
_str = ["Fish frog cheese fromage", 5, 4] call CBA_fnc_substr; // => "frog"
joko // Jonas