我可以“组合"吗?2 正则表达式与逻辑或? [英] Can I "combine" 2 regex with a logic or?

问题描述

我需要将文本框输入验证为信用卡号.我已经有不同信用卡的正则表达式:

I need to validate Textbox input as credit card number. I already have regex for different credit cards:

• 签证:^4[0-9]{12}(?:[0-9]{3})?$
• 万事达卡:^([51|52|53|54|55]{2})([0-9]{14})$
• 美国运通:^3[47][0-9]{13}$

和许多其他人.

问题是，我想根据不同的用户使用不同的正则表达式进行验证.例如:user1 可以使用Visa 和Mastercard，而user2 可以使用Visa 和American Express.所以我想动态生成一个最终的正则表达式字符串，结合上面的一个或多个正则表达式字符串，比如:

The problem is, I want to validate using different regex based on different users. For example: For user1, Visa and Mastercard are available, while for user2, Visa and American Express are available. So I would like to generate a final regex string dynamically, combining one or more regex string above, like:

user1Regex = Visa regex + "||" + Mastercard regex

user2Regex = Visa regex + "||" + American Express regex

有没有办法做到这一点?谢谢，

Is there a way to do that? Thanks,

推荐答案

您没有说明您的语言，但无论出于何种原因，我怀疑它是 JavaScript.就这样做:

You did not state your language but for whatever reason I suspect it's JavaScript. Just do:

var user1Regex = new RegExp('(' + Visaregex + ")|(" + Mastercardregex + ')');
// or if es6:
let user1Regex = new RegExp(`(${Visaregex})|(${Mastercardregex})`);

您也可以使用 (?:) 来加快执行速度(非捕获分组)，但为了便于阅读，我省略了它.

You can also use (?:) for speedier execution (non-capturing grouping) but I have omitted that for readability.

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