The following that would be appropriate to scan through one string, stopping when a character in AL is successfully matched to a character in the string is REPNE CMPSB, REPE CMPSB.
"Comparing a byte in AL or a word in AX with a byte or word pointed to by DI in ES" is what the SCAS instruction does. The string to be found must therefore be relocated to the accumulator register and the target string address must be changed to EDI in order to employ SCAS (EAX and variants).
When using 32 bit systems, setting the direction flag before using SCAS will prevent SCAS from starting. It is not possible to make SCAS "scan a string from the end to the start" on 32 bit computers.
No matter the state of the direction flag, any REP instruction always utilizes the ECX register as a counter and always decreases ECX. This means that using REP SCAS, it is not possible to "scan a string from the end to the beginning."
To know more about string click here:
https://brainly.com/question/24155665
#SPJ4