jQuer源码学习（一）：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{4})/g, rvalidtokens = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[+\-]?\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
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