RegExp in Java - ilya-khadykin/notes-outdated GitHub Wiki

Java provides two classes from java.util.regex for working with Regular Expressions: Pattern and Matcher More details can be found in official documentation:

Here is a simple example of how to use them in Java:

package ru.itandlife.test_regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by Khadykin Ilya on 5/13/2016.
 */
public class RegexExample {
    // String to be scanned to find the pattern.
    private static String SAMPLE_TEXT = "Results <span>1-50</span> of <span>5828</span> (page 1/117)";
    private static String REGEX_PATTERN = "(.+)(\\(page.+)(/.+)";

    public static void main(String[] args) {
        // Create a Pattern object
        Pattern p = Pattern.compile(REGEX_PATTERN);
        // Now create matcher object
        Matcher m = p.matcher(SAMPLE_TEXT);
        // Attempting to find compiled pattern in target String
        if (m.matches()) {
            System.out.println("Source Text: " + m.group(0));
            System.out.println("Pattern: " + REGEX_PATTERN);
            System.out.println("\nThere are " + m.groupCount() + " groups");
            for (int i=1; i<=m.groupCount(); i++) {
                System.out.println("Group Number: " + i);
                System.out.println(m.group(i));
            }
        } else {
            System.out.println("Nothing matches to your pattern");
        }
        // Now we can do other things with found matches
        System.out.println(m.group(2).replaceAll("\\D", ""));
    }
}
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