带有加号的电话号码验证可选 [英] Phone number validation with plus sign optional

问题描述

我如何才能仅在开头和之后验证带有加号的可选电话号码?

How can i validate a phone number with plus sign optional only at the beginning and after that any number of digits with number only.

我尝试过:-

/^\+(?:[\d]*)$/

修改会如何

推荐答案

/^\+?(?:[\d]*)$/

问号表明加号可以存在或不存在.但是，您的表情可以进行很多优化:

The questionmark tells that the plus sign can be there or not. However, your expression can be optimized quite a bit:

/^\+?\d+$/ 

我将 * 更改为 + ，因为表达式只匹配加号. \ d * 建议应匹配0个或多个数字.

I changed the * to a + as the expression would match just a plus sign. \d* suggests that it should match 0 or more digits.

这是 关于Regexr的演示 .

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