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Cucumber Expressions are simple patterns for matching Step Definitions with Gherkin steps

There is a newer version: 18.0.1

package io.cucumber.cucumberexpressions;

/**
 * Transformer for a @{@link ParameterType} with zero or one capture groups.
 *
 * @param  the type to transform to.
 */
@FunctionalInterface
public interface Transformer {
    /**
     * Transforms a string into to an object. The string is either taken
     * from the sole capture group or matches the whole expression. Nested
     * capture groups are ignored.
     * 
     * If the capture group is optional arg may be null.
     *
     * @param arg the value of the single capture group
     * @return the transformed object
     * @throws Throwable if transformation failed
     */
    T transform(String arg) throws Throwable;
}