Find a string inside a longstring
This function takes two longstring inputs and produces the position of one input inside the other.
The $Lstr_Index function accepts three arguments and returns a numeric result.
The first argument is an arbitrary longstring. This is a required argument.
The second argument is a longstring whose length, ironically, must be 255 bytes or less. This is a required argument.
The third argument is a number indicating the position within the first string that a search for a match is to being. This is an optional argument and defaults to 1 meaning the first character.
%result = $Lstr_Index(longstring, str, start)
%result is the position in longstring of str, if there is a match after start, or it is 0 if not.
- $Lstr_Index acts very much like $INDEX except:
- It allows a start position other than 1 (argument 3).
- It cancels the request if the string being searched for (argument 2) is longer than 255 bytes.
- It can operate on LONGSTRING inputs.
- To set %X to 6:
%X = $Lstr_Index('Beauxbatons', 'bat')
- To set %X to 13:
%X = $Lstr_Index('Dudley Dursley', 'ey', 8)