匹配java中一行的多个关键字

Question

我有一行可以匹配多个关键字.整个关键字应该匹配.

例,

 String str = "This is an example text for matching countries like Australia India England";

 if(str.contains("Australia") ||
    str.contains("India") ||
    str.contains("England")){
    System.out.println("Matches");
 }else{
    System.out.println("Does not match");
 }

这段代码工作正常.但如果要匹配的关键字过多,则该行会增长. 有没有优雅的方式编写相同的代码？ 谢谢

Answer 1

你可以写一个这样的正则表达式:

Country0|Country1|Country2

像这样使用它:

String str = "This is an example text like Australia India England";

if (Pattern.compile("Australia|India|England").matcher(str).find())     
    System.out.println("Matches");

如果您想知道哪些国家/地区匹配:

public static void main(String[] args) {

    String str = "This is an example text like Australia India England";

    Matcher m = Pattern.compile("Australia|India|England").matcher(str);
    while (m.find())        
        System.out.println("Matches: " + m.group());
}

输出:

Matches: Australia
Matches: India
Matches: England