lovecoding
/
web0715


			
				
					
						
						
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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
        const reg1 = /\ban\b/ig;
        const str1 = "1an Apple,An2 orange";
        console.log(str1.match(reg1));

        // 2.^ 匹配字母首行
        const reg2 = /^an/ig;
        const str2 = "an1 Apple, An2 orange an";
        console.log(str2.match(reg2));

        // 3.$ 匹配字母尾行
        const reg3 = /an$/ig;
        const str3 = "an1 Apple, An3 orange an";
        console.log(str3.match(reg3));

        const reg4 = /^a$/ig;
        // const str4 = "an1 Apple, An3 orange an";
        console.log(reg4.test('aaa'));
        console.log(reg4.test('a'));
        console.log(reg4.test(' '));
        
    </script>
</body>
</html>