下面這個函數(shù)是js查找一篇英文文章中出現(xiàn)頻率最高的單詞(由26個英文字母大小寫構成)，輸出該單詞及出現(xiàn)次數(shù)，不區(qū)分大小寫，主要是正則的運用：

function counts(article){ article = article.trim().toUpperCase(); var array = article.match(/[A-z]+/g); article = " "+array.join(" ")+" "; var max = 0,word,num = 0,maxword=""; for(var i = 0; i < array.length; i++) {    word = new RegExp(" "+array[i]+" ",'g'); num = article.match(word).length; if(num>max){  max=num;  maxword = array[i]; } } console.log(maxword+" "+max);}counts("Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day;");

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