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.\b 单词边界
        var reg1 = /\ban\b/gi;
        const str1 = 'An cat, is aAn animal';
        console.log(str1.match(reg1));
        // 2.^ 匹配字母首行
        const reg2 = /^ab/;
        console.log(reg2.test("ababab"));
        // 3.$ 匹配字母尾行
        const reg3 = /ab$/;
        console.log(reg3.test("abababa"));

        const reg4 = /^a$/;
        console.log(reg4.test("aaa"));
        console.log(reg4.test("a"));
        console.log(reg4.test(" "));
    </script>
</body>
</html>