语法?i:x使字符串搜索不区分大小写。例如
public class RegCaseSense { public static void main(String[] args) { String stringSearch = "嗨,我们在java课上。"; //这是行不通的,因为模式是大写 System.out.println("Try this 1: " + stringSearch.matches(".*CLASS.*")); //神奇的(?i:X)语法使此搜索不区分大小写,因此返回true- System.out.println("Try this 2: " + stringSearch.matches("(?i:.*CLASS.*)")); } }