JavaRegexpTest2.java

package cg;

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

/**
 * @author Sergey Mashkov (cy6erGn0m)
 * @since 04.03.13
 */
public class JavaRegexpTest2 {

    private final CharSequenceProxy seq;
    private final List<String> patterns = new ArrayList<>();

    public JavaRegexpTest2(CharSequence input) {
        this.seq = new CharSequenceProxy(input);
    }

    public static void main(String[] args) {
        String input = "7778889990223344556677889900112244334433";

        new JavaRegexpTest2(input)
                .findAll("[0123]123456|98765")
                .printInfo();

        new JavaRegexpTest2(input)
                .findAll("98765|[0123]123456|7")
                .printInfo();

        new JavaRegexpTest2(input)
                .findAll("[0123]123456")
                .findAll("98765")
                .printInfo();
    }

    private void printInfo() {
        for (String pattern : patterns) {
            System.out.print(pattern);
            System.out.print("  ");
        }

        System.out.print(" - ");
        System.out.println(seq.getCounter());
    }

    private JavaRegexpTest2 findAll(String pattern) {
        findAll(Pattern.compile(pattern).matcher(seq));
        patterns.add(pattern);

        return this;
    }

    private static void findAll(Matcher m) {
        while (m.find());
    }
}

class CharSequenceProxy implements CharSequence {

    private final CharSequence source;
    private int counter = 0;

    CharSequenceProxy(CharSequence source) {
        this.source = source;
    }

    @Override
    public int length() {
        return source.length();
    }

    @Override
    public char charAt(int index) {
        counter++;
        return source.charAt(index);
    }

    @Override
    public CharSequence subSequence(int start, int end) {
        throw new UnsupportedOperationException();
    }

    @Override
    public String toString() {
        return source.toString();
    }

    public int getCounter() {
        return counter;
    }
}

output.txt

[0123]123456|98765   - 93
98765|[0123]123456|7   - 142
[0123]123456  98765   - 58