Add mode to StringRegExp

[asdf8]

I propose add an additional mode to function StringRegExp - to allow for cases where the function returns an array (flag = 1, 2 or 3) can be obtained at the output of the function two-dimensional array, the second column which contains the position of the found text to the original string.

[MrCreatoR <mscreator@…>]

Very good idea, or at least set @extended for flag 3, then we could calculate the position of each match in a loop (with StringLen).

[Jpm]

Hi,
Flag = 1 and 2 already return the offset after the capture group
for 3,4 it is better the user can use the return offset in @rxtended and loop with it if needed

that what is done in the propose fix sent to Jon