CODEWITHSUNDEEP
javaregex
user2600629
user2600629

Reputation: 561

Finding first word after regex match

How do I grab the first word after my match?

For example, once I find Car, how do I grab Chevy?

public class NewExtractDemo {
    public static void main(String[] args) {
        String input = "I have the following Car: Chevy, Truck: Ford, Van: Honda";

        Pattern p = Pattern.compile("(Car|Truck|Van)");
        Matcher m = p.matcher(input);

        List<String> Search = new ArrayList<String>();
        while (m.find()) {
            System.out.println("Found a " + m.group() + ".");
            Search.add(m.group());
        }
    }
}

Upvotes: 3

Views: 7214

Answers (2)

Paul Vargas
Paul Vargas

Reputation: 42010

Consider using a constant to avoid recompiling the regular expression each time.

/* The regex pattern that you need: (?<=(Car|Truck|Van): )(\w+) */
private static final REGEX_PATTERN = 
                                 Pattern.compile("(?<=(Car|Truck|Van): )(\\w+)");

public static void main(String[] args) {
    String input = "I have the following Car: Chevy, Truck: Ford, Van: Honda";
    Matcher matcher = REGEX_PATTERN.matcher(input);
    while (matcher.find()) {
        System.out.println(matcher.group());
    }
}

Output:

Chevy
Ford
Honda

Upvotes: 0

arshajii
arshajii

Reputation: 129497

Use capturing groups:

(Car|Truck|Van):\s*(\w+)

Now .group(1) will return Car and .group(2) will return Chevy.

String input = "I have the following Car: Chevy, Truck: Ford, Van: Honda";

Pattern p = Pattern.compile("(Car|Truck|Van):\\s*(\\w+)");
Matcher m = p.matcher(input);

while (m.find()) {
    System.out.println(m.group(1) + "\t" + m.group(2));
}

Car     Chevy
Truck   Ford
Van     Honda

Upvotes: 16

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