lovecoding
/
web0331


			
				
					
						
						
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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
        const reg = /\ban\b/gi;
        const str1 = 'A Cat and An apple';
        console.log(str1.match(reg));
        // 2.匹配字母首行 ^
        const reg1 = /^ab/;
        console.log(reg1.test('abaabab'));
        const reg2 = /ab$/;
        // 3.匹配字母尾行 $
        console.log(reg2.test('abaabacb'));

        const reg3 = /^a$/;
        console.log(reg3.test("aaa"));
        console.log(reg3.test("a"));
        console.log(reg3.test(" "));

    </script>
</body>
</html>