Java Matcher对象中 find() 与 matches() 的区别

悠悠 2024-03-01 03:21 21阅读 0赞

> `find()`：字符串**某个部分匹配上**正则表达式就会返回true  
> `matches()`：整个字符串**都匹配上**正则表达式才返回true，否则false  
> 参考：**[Java Matcher对象中find()与matches()的区别][Java Matcher_find_matches]**  
> 参考：**[Pattern隐藏了哪些Java8追加的新功能][Pattern_Java8]**  
> 参考：**[Matcher类有哪些我们必须掌握的方法？][Matcher]**

Pattern compile = Pattern.compile("[WASD][0-9]{1,2}");
    System.out.println(compile.matcher("A1").find());  //true
    System.out.println(compile.matcher("A12").find());  //true
    System.out.println(compile.matcher("E12").find());  //false
    System.out.println(compile.matcher("AE12").find());  //false
    System.out.println(compile.matcher("AEA12").find());  //true
    System.out.println(compile.matcher("AEA1A2").find());  //true
    System.out.println(compile.matcher("AEA12444").find());  //true
    
    Pattern compile = Pattern.compile("[WASD][0-9]{1,2}");
    System.out.println(compile.matcher("A122").matches());  //false
    System.out.println(compile.matcher("AA12").matches());  //false
    System.out.println(compile.matcher("A12").matches());  //true
    System.out.println(compile.matcher("A1").matches());  //true
    System.out.println(compile.matcher("AA1").matches());  //false
    System.out.println(compile.matcher("AA12").matches());  //false
    
    System.out.println("A122".matches("[WASD][0-9]{1,2}")); // false
    System.out.println("AA12".matches("[WASD][0-9]{1,2}")); // false
    System.out.println("A12".matches("[WASD][0-9]{1,2}")); // true
    System.out.println("A1".matches("[WASD][0-9]{1,2}")); // true
    System.out.println("A1".matches("[WASD]{1,2}[0-9]{1,2}")); // true
    System.out.println("A12".matches("[WASD]{1,2}[0-9]{1,2}")); // true
    System.out.println("AA1".matches("[WASD]{1,2}[0-9]{1,2}")); // true
    System.out.println("AA12".matches("[WASD]{1,2}[0-9]{1,2}")); // true

[Java Matcher_find_matches]: https://juejin.cn/post/7105779889977950244
[Pattern_Java8]: https://juejin.cn/post/7105772800744357925
[Matcher]: https://juejin.cn/post/7105780859831058468