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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### 字符匹配 匹配類似 <%XXX%> 的字符串 ~~~ var reg=new RegExp('<%[^%>]+%>','g'); var reg=/<%[^%>]%>/g; ~~~ 匹配單詞的邊界和字母的開始和結束位置。 ~~~ \bA.{5}T\b ~~~ 這個表達式有更強的特指性(請記住特指性,specificity,這個概念很重要),它匹配單詞ANCYENT,也就是ancient的老寫形式。這是如何做到的呢? * 簡寫式\b匹配單詞邊界,不消耗任何字符; * 字符A和T限定了字符序列的首尾字母; * .{5}匹配任意五個字符; * 簡寫式\b匹配單詞的另一個邊界。 這個正則表達式實際上可以匹配`ANCYENT`和`ANCIENT`。 #### 判斷http地址 ~~~ ^(http[s]?:\/\/)?[^\s]+ ~~~ ### 數值匹配 整數及小數匹配 ~~~ (?:\d*\.)?\d+ ~~~ 實例 ~~~ var str="Give 100% support 0.1 or .2percent!"; var patt1=/(?:\d*\.)?\d+/g; document.write(str.match(patt1)); //100,0.1,.2 ~~~
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