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正则表达式2.html

<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>

</body>
<script>
    var reg = /a{3}/;
    console.log(reg.test("baaac"));  // true

    var reg2 = /(ab){3}/;
    console.log(reg2.test("cabababc"));  // true

    var reg3 = /ab{3,}c/;

    // 检查一个字符串是否以a开头
    reg4 = /^a/;
    console.log(reg4.test("qabc"));  // false

    // 检查一个字符串是否以a结尾
    reg5 = /a$/;
    console.log(reg5.test("qabcaw"));  // false

    reg6 = /^a$/;
    console.log(reg6.test("a"));  // true

    var phoneStr = "13022456789";
    var phoneReg = /^1[3-9][0-9]{9}$/;
    console.log(phoneReg.test(phoneStr));  // true
</script>
</html>