lovecoding
/
VIP26


			
							1234567891011121314151617181920212223242526272829303132333435363738
							<!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>
        // 单词边界 \b
        // const reg = /\bcat\b/g;
        // const str = 'This is a cat it is a scattered';
        // console.log(str.replace(reg,'dog'))


        // ^ 匹配字母行首
        // const reg = /^ac/i;
        // console.log(reg.test('acc'))
        // console.log(reg.test("bca"))
        // console.log(reg.test("Abca"))


        // $ 匹配字母行尾
        // const reg = /c$/;
        // console.log(reg.test('ccc'))
        // console.log(reg.test(''))
        // console.log(reg.test('cb'))
        // console.log(reg.test('ac'))

        const reg = /^a$/;
        console.log(reg.test('a a'))
        console.log(reg.test(''))
        console.log(reg.test('aba'))
        console.log(reg.test('bbb'))

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