8.2 规则

<script>
    //1.任意字符...
    var reg1 = /.../;
    console.log(reg1.test('a')); //false
    console.log(reg1.test('aaaa')); //true
    //2. \w 字母 数字 下划线
    var reg2 = /\w\w/;
    console.log(reg2.test('_a23'));
    console.log(reg2.test('$3'));
    //3. \s 任意空白字符 (制表符，回车符，换页符和丨)
    var reg3 = /..\s../;
    console.log(reg3.test("aa bb"));
    console.log(reg3.test('aa  bb'));
    //4 \d 匹配数字，等同于[0-9]
    var reg4 = /\d\d\d\d/;
    console.log(reg4.test('9999'));
    //5 \D 匹配非数字，等同于\[^0-9]
    var reg5 = /\d\D\d/
    console.log(reg5.test("hjsafsgjtuytue"));
    console.log(reg5.test('4s4'));
    //6. | 或匹配
    var reg6 = /abc|xyz/;
    console.log(reg6.test('dagdayurtsabcfyaifuysxyz'));
    //7. [xyz] 表示包含xyz里面的任意一个,相当于x|y|z
    var reg7 = /[abc]/;
    console.log(reg7.test('a'));//true
    console.log(reg7.test('iimooijoi'));//false
    // [a-zA-Z]  匹配所偶有的大小写字母 [0-9]相当于\d
    //8. [^x] 匹配除“x”之外的所有字符，其中‘x’可以为任意字符
    var reg8 = /[^s]/;
    console.log(reg8.test('dsadafafa'));//true
    console.log(reg8.test('sssssss'));//false
    //9.[^xyz]
    var reg9 = /[^abc]/;
    console.log(reg9.test('a'));//false
    console.log(reg9.test('ooimoioihoi'));//true
    //10. ^ 匹配字符串的开始
    var reg10=/^1\d\d\d\d\d\d\d\d\d\d$/; //11个数字
    console.log(reg10.test('13822222222'));
    console.log(reg10.test('24353456436573'));
    //11. $ 匹配字符串的结束
    //12. \ 转义字符
    var reg12=/\.com/;
    console.log(reg12.test('acom'));
    console.log(reg12.test('fafahfgf.com'));
    //13. ? 重复出现零次或一次
    var reg13=/^https?/;
    console.log(reg13.test('http:ihfaifhaifhakfahj'));
    console.log(reg13.test('https://dafasfasfafa'));
    //14. + 重复出现一次或多次
    var reg14=/a+/;
    console.log(reg14.test('hfkjsfahfha'));
    console.log(reg14.test('ohkookhokooi'));
    //15. * 重复出现零次或多次
    var reg15=/^https?.*/;
    console.log(reg15.test('http:fhajysfte'));
    //16. {n} 重复出现n次
    var reg16=/^1\d{10}$/;
    console.log(reg16.test('12'));
    //17. {n,} 至少重复出现n次
    var reg17=/^1\d{10,}/
    //18.{m,n} 重复出现m到n次，其中m<n
    var reg=/\d{m,n}/
</script>