Java（33）：正则表达式

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexDemo {
    public static void main(String[] args) {
        
//        1. compile(String regex) 将给定的正则表达式编译到模式中。 
//        2. matcher(CharSequence input) 创建匹配给定输入与此模式的匹配器。 
//        3. matches() 尝试将整个区域与模式匹配。
        
        String str = "abc";
//        1.编译正则规则形式
        Pattern p = Pattern.compile("abc");
//        2.将正则进行匹配
        Matcher m = p.matcher(str);
//        3.进行判断
        boolean b = m.matches();
        System.out.println(b);
        
        String str2 = "agx";
        Pattern p2 = Pattern.compile("[abc][efgh][xyz]");
        Matcher m2 = p2.matcher(str2);
        boolean b2 = m2.matches();
        System.out.println(b2);
        
        String str3 = "agx";
        System.out.println(str3.matches("[abc][efgh][xyz]"));
        
        String str4 = "D";
        Pattern p4 = Pattern.compile("[a-zA-Z]");
        Matcher m4 = p4.matcher(str4);
        boolean b4 = m4.matches();
        System.out.println(b4);
        
        String str5 = "5";
        System.out.println(str5.matches("[0-9]"));
        
        String str6 = "Hello world, this is java code.";
        String pattern6 = ".*world.*";
        boolean b6 = Pattern.matches(pattern6, str6);
        System.out.println(b6);
        
        String str7 = "I have a dream.";
        String pattern7 = ".*dream";
        boolean b7 = Pattern.matches(pattern7, str7);
        System.out.println(b7);
        
    }
    
}