jQuer源码学习（1）：正则表达式

quickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)/, //匹配HTML标签
        
rnotwhite = /\S/,          
trimLeft = /^\s+/, //去除左边的空格
trimRight = /\s+$/, //去除右边的空格
rsingleTag = /^<(\w+)\s*\/?>(?:<\/\1>)?$/,//单tag : 例：$("<img>")即创建img节点相当于documeng.createElement("img")
/**
  * 匹配json
  */
rvalidchars = /^[\],:{}\s]*$/, 
rvalidescape = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, 
rvalidtokens = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, 
rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g,
 /**
  * 浏览器检查
  */
rwebkit = /(webkit)[ \/]([\w.]+)/, //webkit内核
ropera = /(opera)(?:.*version)?[ \/]([\w.]+)/, //opera内核
rmsie = /(msie) ([\w.]+)/, //ie内核
rmozilla = /(mozilla)(?:.*? rv:([\w.]+))?/, //mozilla内核