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① 判斷 String 是否符合正則要求
patt.test(String);
② 找出字串中符合正則的子串
patt.exec(String);
【例】表單提交：
a.使用者名稱不可為空，只能是數字及字母，6-11位
b.email 不可為空且格式正確
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> table{ width:400px; height:400px; border:0; border-collapse: collapse; background:orange; } td{ border: 1px solid gray; cursor:pointer; } </style></head><body> <form action=""> <p>使用者名稱:<input type="text" name="username" id=""></p> <p>Email:<input type="text" name="email" id=""></p> <p><input type="submit" value="提交"></p> </form></body><script> document.getElementsByTagName("form")[0].onsubmit = function(){ var patt = /^[a-zA-Z0-9]{6,11}$/; if(!patt.test(document.getElementsByName("username")[0].value)){ alert("使用者名稱只能是6-11位元字及字母組成"); return false; } patt = /^[a-zA-Z0-9\.-][email protected]\w+(\.\w+)+$/; //網域名稱不能有_,可以有- if(!patt.test(document.getElementsByName("email")[0].value)){ alert("郵箱錯誤"); return false; } }</script></html>
Javascript 筆記與總結（2-18）正則驗證與正則匹配
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