Question

How to use \w regular expression (REGEX) in Java

Answer 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
    
public class Example {
    private static void searchREGEX(String regex, String... search) {
        Pattern pattern = Pattern.compile(regex);
        
        for (String input : search) {
            Matcher matcher = pattern.matcher(input);
   
            boolean found = false;
            
            while (matcher.find()) {
                System.out.println(String.format("Found" + " \"%s\" " + "from index %d to %d",
                                            matcher.group(), matcher.start(), matcher.end()));
                found = true;
            }
            
            System.out.println();
            
            if (!found) {
                 System.out.println(String.format("%s: \"%s\" Not found\n", regex, input));
            }
        }
    }  
    public static void main(String[] args) {
        // \w (A word character: [a-zA-Z_0-9])
        searchREGEX("\\w", " ", "1", "f35 airplane", ".", "a!");
    }
}
    
    
/*
run:
 
 
\w: " " Not found

Found "1" from index 0 to 1

Found "f" from index 0 to 1
Found "3" from index 1 to 2
Found "5" from index 2 to 3
Found "a" from index 4 to 5
Found "i" from index 5 to 6
Found "r" from index 6 to 7
Found "p" from index 7 to 8
Found "l" from index 8 to 9
Found "a" from index 9 to 10
Found "n" from index 10 to 11
Found "e" from index 11 to 12


\w: "." Not found

Found "a" from index 0 to 1
     
*/

 

 

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