Peter Thoeny
2020-11-28 16:07:58
此正则表达式允许
- 一个单斜线，或
- 一个斜线，随后的字母数字字符和破折号，重复1次或多次：
let urls = [
'/',
'/aaa-bbb',
'/aaa-bbb/ccc',
'/aaa-bbb/ccc/ddd',
'/aaa-bbb/ccc/ddd/eee',
'', // empty
'//double-slash',
'/end-with-slash/',
];
let regex = /^(\/|(\/[a-zA-Z0-9\-]+)+)$/;
urls.forEach((url) => {
let result = regex.test(url);
console.log('"' + url + '" ==> ' + result);
});结果：
"/" ==> true
"/aaa-bbb" ==> true
"/aaa-bbb/ccc" ==> true
"/aaa-bbb/ccc/ddd" ==> true
"/aaa-bbb/ccc/ddd/eee" ==> true
"" ==> false
"//double-slash" ==> false
"/end-with-slash/" ==> false
从结果中可以看到，它可以防止出现空的URL路径，带有双斜杠的URL路径以及以斜杠结尾的URL路径。
正则表达式的说明：
^(\/|(...)+)$-期望一个斜杠或括号中的1+序列\/[a-zA-Z0-9\-]+$-括号中的序列为斜杠，后跟一个或多个字母数字和破折号
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