lovecoding
/
Vip4.0W


			
				
					
						
						
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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.单词边界 \b
        var reg = /\bab\b/gi;
        const str = 'Ab apple,aba sda';
        console.log(str.match(reg));

        // 2.匹配字母首行
        const reg1 = /^ab/;
        console.log(reg1.test("abbab"));

        // 3.匹配字母尾行
        const reg2 = /ab$/;
        console.log(reg2.test("abbabb"));

        const reg3 = /^a$/;
        console.log(reg3.test("aaa"));
        console.log(reg3.test("a"));
        console.log(reg3.test(" "));
    </script>
</body>
</html>