目录前言一、基础概念1. 什么是正则表达式？2. Java中正则表达式的两个核心类：二、基本语法1. 普通字符2. 特殊字符（元字符）3. 常用元字符4. 量词三、Java中使用正则表达式1. 简单匹配示例2. 完整使用步骤3. 常用方
iam having a table with columns like id || counter if i do something (some event) i want the coun开发者_开发技巧ter\'s value(at a particular id) to increase by one , currently iam doing this :
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