1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <meta name="viewport" content="width=device-width, initial-scale=1.0">
6 <title>Document</title>
7 <script>
8 /* 验证 */
9 //定义一个正则表达式
10 var reg = /o/
11 //自定义一个字符串
12 var str = 'hello world!'
13 //校验是否符合正则的规则
14 console.log(reg.test(str))
15
16 /* 匹配 */
17 var reg = /o/g //g是全局的意思，不带g只匹配第一个
18 var str = 'hello world!'
19 var result = str.match(reg)
20 console.log(result)
21
22 /* 替换 */
23 var reg = /o/gi //i是忽略大小写
24 var str = 'hello wOrld!'
25 var newstr = str.replace(reg,'@')
26
27 /* 验证 */
28 var str1 = 'java love me'
29 var str2 = 'I love java'
30 var reg1 = /^java/ //测试是否以java开头
31 var reg2 = /java$/ //测试是否以java结尾
32 console.log(reg1.test(str1))
33 console.log(reg2.test(str2))
34
35 /* 验证 */
36 //必须是字母开头，长度必须是6-10位，后面其他字符可以是大小写字母、数字、_
37 var str = ''
38 var reg = /^[a-zA-Z][a-zA-Z0-9_]{5,9}$/
39 console.log(reg.test(str))
40 </script>
41 </head>
42 <body>
43
44 </body>
45 </html>
标签：java,log,16,正则表达式,var,str,字符串,console,reg From： https://www.cnblogs.com/IrVolcano/p/18100165