lovecoding
/
web250825


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 1. 任意匹配 []
        // const reg = /[abc]/;
        // console.log(reg.test("ababab"));
        // console.log(reg.test("abc"));
        // console.log(reg.test("acbacb"));
        // console.log(reg.test("acacac"));
        // console.log(reg.test("dfdfdf"));

        // 2.连字符 -
        const reg1 = /[0-9]/;
        const reg2 = /[a-z]/;
        const reg3 = /[A-Z]/;
        const reg4 = /[a-zA-Z0-9_]/;
        console.log(reg1.test(4))

        // 3.取反 ^
        const reg5 = /[^0-9]/
        console.log(reg5.test(4))

        // 4. . 除换行空格外的任意字符
        const reg6 = /./;
        console.log(reg6.test("aaa"));
        console.log(reg6.test("1234567890"));
        console.log(reg6.test(""));
        console.log(reg6.test("\n"));
        console.log(reg6.test("\r"));
        
    </script>
</body>
</html>