用逗号或逗号和空格分隔的项目列表的正则表达式 [英] Regular expression for a list of items separated by comma or by comma and a space

问题描述

嘿，我不知道如何为我的网站编写正则表达式，我想让用户输入以逗号或逗号和空格分隔的项目(标签)列表，例如apple, pie,applepie".有可能有这样的正则表达式吗?谢谢！

Hey, I can't figure out how to write a regular expression for my website, I would like to let the user input a list of items (tags) separated by comma or by comma and a space, for example "apple, pie,applepie". Would it be possible to have such regexp? Thanks!

我想要一个 javascript 的正则表达式，以便在用户提交表单之前检查输入.

I would like a regexp for javascript in order to check the input before the user submits a form.

推荐答案

您要寻找的东西看似简单:

What you're looking for is deceptively easy:

[^,]+ 

这将为您提供每个逗号分隔的标记，并将排除空标记(如果用户输入a,,b"，您将只会得到a"和b")，但如果他们输入"a, , b".

This will give you every comma-separated token, and will exclude empty tokens (if the user enters "a,,b" you will only get 'a' and 'b'), BUT it will break if they enter "a, ,b".

如果你想从两边正确地去除空格(并排除只有空格的元素)，那么它会变得稍微复杂一点:

If you want to strip the spaces from either side properly (and exclude whitespace only elements), then it gets a tiny bit more complicated:

[^,\s][^\,]*[^,\s]*

然而，正如一些评论中提到的，为什么你需要一个正则表达式，其中一个简单的拆分和修剪就可以解决问题?

However, as has been mentioned in some of the comments, why do you need a regex where a simple split and trim will do the trick?

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