<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>正则表达式2</title>
<script type="text/javascript">
// var p1 = /^a/; //匹配以a开头
// console.log(p1.test("a"));//true
// console.log(p1.test("abc"));//true
// console.log(p1.test("bc"));//false
// console.log(p1.test("bac"));//false
// var p2 = /a$/; //匹配以a结尾
// console.log(p2.test("abca"));//true
var p2 = /^a$/; //匹配以a开头,以a结尾
console.log(p2.test("ab"));//false
console.log(p2.test("b"));//false
console.log(p2.test("aaa"));//false
console.log(p2.test("a"));//true
//javascript 正则表达式
</script>
</head>
<body>
</body>
</html>