public void c(){
String str = "abcabcabcabdcabc";
Pattern pattern = Pattern.compile("a");
Matcher findMatcher = pattern.matcher(str);
int number = 0;
while(findMatcher.find()) {
number++;
if(number == 2){//当“a”第二次出现时停止
break;
}
}
int start = findMatcher.start();//“A”第二次出现的位置
System.out.println("'a'第二次出现的位置是:"+start);
int end = str.indexOf("d");
String substring = str.substring(start+1, end);
System.out.println(substring);
}
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