字符串中包含指定字符串

public static void main(String[] args) {

        String str = "abcdefgabc";
        Pattern pattern = Pattern.compile("abc");
        Matcher matcher = pattern.matcher(str);

        int i = 0;
        while (matcher.find()) {
            //matcher.group();
            i++;
        }
        System.out.println(i);
    }

 

String[] test ={"abcabc","abcadc", "abc/nabc"};
String X="abc";
String reg="^(?is)(?:(?!" + X + ").)*" + X + "(?:(?!" + X + ").)*$";
for(String s : test){
    Matcher m = Pattern.compile(reg).matcher(s);
    if(m.find()){ System.out.println("源字符串：" + s + " 匹配结果： " + true);
    }else{
        System.out.println("源字符串：" + s + " 匹配结果： " + false);
    }
}