src/test/java/com/googlecode/aviator/example/RegularExpressionExample.java

package com.googlecode.aviator.example;

import java.util.HashMap;
import java.util.Map;

import com.googlecode.aviator.AviatorEvaluator;

public class RegularExpressionExample {
    public static void main(String[] args) {
        String email = "killme2008@gmail.com";
        Map<String, Object> env = new HashMap<String, Object>();
        env.put("email", email);
        String username = (String) AviatorEvaluator.execute("email=~/([\\w0-8]+)@\\w+[\\.\\w+]+/ ? $1:'unknow'", env);
        System.out.println(username);
    }
}