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There is a newer version: 1.0.11

package jscl.text;

import jscl.NumeralBase;
import jscl.math.Generic;
import jscl.text.msg.Messages;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class Digits implements Parser {

	@Nonnull
	private final NumeralBase nb;

	public Digits(@Nonnull NumeralBase nb) {
		this.nb = nb;
	}

	// returns digit
	public String parse(@Nonnull Parameters p, @Nullable Generic previousSumElement) throws ParseException {
		int pos0 = p.getPosition().intValue();

		final StringBuilder result = new StringBuilder();

		ParserUtils.skipWhitespaces(p);

		if (p.getPosition().intValue() < p.getExpression().length() && nb.getAcceptableCharacters().contains(p.getExpression().charAt(p.getPosition().intValue()))) {
			result.append(p.getExpression().charAt(p.getPosition().intValue()));
			p.getPosition().increment();
		} else {
			ParserUtils.throwParseException(p, pos0, Messages.msg_9);
		}

		while (p.getPosition().intValue() < p.getExpression().length() && nb.getAcceptableCharacters().contains(p.getExpression().charAt(p.getPosition().intValue()))) {
			result.append(p.getExpression().charAt(p.getPosition().intValue()));
			p.getPosition().increment();
		}

		return result.toString();
	}
}