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This is the core library for Active Objects. It is generic and can be embedded in any environment. As such it is generic and won't contain all connection pooling, etc.

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package net.java.ao.schema;

import java.util.regex.Pattern;

final class UnderScoreUtils {
    private static final Pattern WORD_PATTERN = Pattern.compile("([a-z\\d])([A-Z])");

    private UnderScoreUtils() {
    }

    static String camelCaseToUnderScore(String s) {
        return WORD_PATTERN.matcher(s).replaceAll("$1_$2");
    }
}