Question

I have a line from which multiple keywords are to be matched. The whole keywords should be matched.

Example,

 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");
 }

This code works fine. But if there are too many keywords to be matched, the line grows. Is there any elegant way of writing the same code?
Thanks

Answer 1

Your can write a regular expression like this:

Country0|Country1|Country2

Use it like this:

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

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

If you would like to know which countries has matched:

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());
}

Outputs:

Matches: Australia
Matches: India
Matches: England