Returns the position of the column that begins the first occurrence of one string within another string for column-based writing systems, such as Thai.
InStrc(off, string1, string2)
off
The number of the offset
string1
A string containing Thai-based columns
string2
A second string containing columns
The position of the column that begins the first occurrence of one string within another.
If off is greater than the length in bytes of string1 or string2, the function returns an empty string.