从输入中去除除+"和数字以外的所有字符后，应该这样做:

After stripping all characters except '+' and digits from your input, this should do it:

^+[1-9]{1}[0-9]{3,14}$

如果您想更准确地了解国家/地区代码，请参阅列表中的此问题电话号码国家/地区代码

If you want to be more exact with the country codes see this question on List of phone number country codes

但是，我会尽量不要对我的验证过于严格.如果用户被告知他们的有效号码不可接受，他们会非常沮丧.

However, I would try to be not too strict with my validation. Users get very frustrated if they are told their valid numbers are not acceptable.