package org.xdemo.superutil; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * 常用的正则表达式 * @author http://www.xdemo.org/ * 252878950@qq.com */ public class RegexUtils {

I know of Google Code Search and Koders. These two sites help me find usage of some of the libraries, where official documentation of the libraries would go only so far. If you know of some other tool

macOS       https://kapeli.com/dash        Dash gives your Mac instant offline access to 150+ API documentation setscumen Windows     http://velocity.silverlakesoftware.com/ Velocity gives your