lovecoding
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VIP32


			
				
					
						
						
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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>
        var str = "A Banana,see you again.see you tomorrow.A Cat"
        // 1.单词边界
        const reg = /\ba\b/gi;
        console.log(str.match(reg))
        // console.log(reg.test(str));
        // 2. ^ 匹配字母首行
        // const reg1 = /^h/;
        // console.log(reg1.test("ahahaha"))//f
        // console.log(reg1.test("hahahaah"))//t
        // console.log(reg1.test("ch"))//f
        // console.log(reg1.test("hc"))//t
        // console.log(reg1.test("ddh"))//f
        // console.log(reg1.test("hdh"))//t
        // 3.$ 匹配字母尾行
        // const reg2 = /ch$/;
        // console.log(reg2.test("ahahaha"))//f
        // console.log(reg2.test("hahahaah"))//t
        // console.log(reg2.test("ch"))//t
        // console.log(reg2.test("hc"))//f
        // console.log(reg2.test("ddh"))//t
        // console.log(reg2.test("hdh"))//t
        
        const reg3 = /^hhhhhh$/
        console.log(reg3.test("ahahaha"))//false
        console.log(reg3.test("hahahaah"))//false
        console.log(reg3.test("ch"))//false
        console.log(reg3.test("hc"))//false
        console.log(reg3.test("ddh"))//false
        console.log(reg3.test("hdh"))//false
        console.log(reg3.test(" "))//false
        console.log(reg3.test("h"))//true
    </script>
</body>
</html>