var myPattern = /[a-z]+/;var theStr = "this is a dog,that is a cat!"console.log(theStr.replace(myPattern, "a")); //a is a dog,that is a cat! 贪婪的，把this都匹配了！
var myPattern = /[a-z]+?/;var theStr = "this is a dog,that is a cat!"console.log(theStr.replace(myPattern, "a")); //ahis is a dog,that is a cat! 非贪婪的，只把this中的t匹配了！
最后，RegExp实例继承的toLocaleString()和toString()方法都会返回正则表达式的字面量，即/abc/
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