使用javascript将用户输入限制为带有正则表达式的逗号分隔的单词

Question

I want to force the user to enter any combination of the following words. the words need to be comma delimited and no comma at the beginning or end of the string the user should only be able to enter one of each word.

Examples

admin
basic,ectech
admin,ectech,advanced
basic,advanced,admin,ectech

my attempt

^((basic|advanced)|admin|ectech)((,basic|,advanced)|,admin|,ectech){0,2}$

Answer 1

使用regex确实不是一种好方法，因为如果不需要特定的顺序，则regex确实没有一种好的方法来处理“只允许输入给定单词一次”。

Answer 2

I would do a double attack on this. In your validation function, use a regex as well as a JavaScript hashtable to store words that have already been entered so as to prevent duplicates from being entered.

Answer 3

I would suggest to split your requirement into several parts:

1. split the string using the str.split("[,]") and get an array of strings

2. validate each element of the array using expression like ^(bacic|advanced|..)$

3. use hashtable to put each array element into that and if element is added more than once then fail validation

EDIT : Actualy in step 2 you can use another hashtable that will store all your words. It will be faster to check against hashtable than to run a regular expression.