java正则表达式-语法规则学习：

public class RegExp03 {
    public static void main(String[] args){
        String content = "a11bcd!2_c32de BCDe";
        //String resStr = "[a-z]";  //匹配a-z之间任意一个字符
        //String resStr = "[A-Z]";  //匹配A-Z之间任意一个字符
        //String resStr = "[abc]";   //匹配abc字符串[默认区分大小写]
        //String resStr = "[(?i)abc]";  //匹配abc字符串(不区分大小写)
        //(?i):表示不区分大小写 等价于Pattern.CASE_INSENSITIVE
        //String resStr = "[0-9]";  //匹配0-9之间任意一个字符
        //String resStr = "\\d";      //匹配0-9之间任意一个字符
        //String resStr = "\\D";      //匹配不在0-9之间任意一个字符
        //String resStr = "\\w";     //匹配大小写英文字母，数字，下划线
        //String resStr = "\\W";      //匹配    等价于[^a-zA-Z0-9_]
        //String resStr = "\\s";      //匹配任何空白字符（空格，制表符）
        String resStr = "\\S";      //匹配任何非空白字符，和\\s相反
        //1.构造模式对象Pattern
        //Pattern pattern = Pattern.compile(resStr,Pattern.CASE_INSENSITIVE);
        Pattern pattern = Pattern.compile(resStr);
        //2.创造匹配器对象Matcher
        Matcher matcher =pattern.matcher(content);
        while (matcher.find()){
            System.out.println("找到:"+matcher.group(0));
        }

    }
}