Syntax:

Rep(target, origin, pos_target, len_origin)

Parameters:

target: The target Alpha string or expression where the replacement will take place.

origin: The Alpha string or expression that provides the substring to be copied to target.

pos_target: The first position in the target string that will receive the substring from origin.

len_origin: The number of characters that will be moved from origin to target, starting from the leftmost character of origin.

Returns:

Alpha string containing modified target string.