查找匹配字符串

DATAS SEGMENT 
SENTNECE DB 50H,?,50H DUP(?) 
KEYWORD DB 10H,?,10H DUP(?) 
MATCH DB 0AH,0DH,"Match at location:$" 
NOMATCH DB 0AH,0DH,"NO match$" 
MSG3 DB 0AH,0DH,"Enter Keyword:$"
MSG4 DB 0AH,0DH,"Enter Sentence:$"
DATAS ENDS 

STACKS SEGMENT 
STACKS ENDS 

CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS 
START: 
MOV AX,DATAS 
MOV DS,AX  ;移近段地址
LEA DX,MSG3 ;Enter keyword的偏移地址移近DX
MOV AH,09H 
INT 21H ;输出Enter keyword
LEA DX,KEYWORD 
MOV AH,0AH 
INT 21H ;DS:DX（KEYWORD）的地址开始接受关键字
AGAIN: ;初始化阶段
LEA DX,MSG4
MOV AH,09H
INT 21H ;输出Enter Sentence
LEA DX,SENTNECE
MOV AH,0AH 
INT 21H ;DS:DX(SENTENCE)的地址开始接受句子