域名可以有两个连续的连字符吗 [英] Can domain name have two continuous hyphens
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问题描述
我在SO上查询了几个问题，这似乎表明不允许使用两个连续的连字符(例如my--website.com)，但是当我在使用正则表达式对URL/域进行验证?(铁轨)
I looked up couple of questions on SO, which seem to suggest that two continuous hyphens (e.g. my--website.com) are not allowed but when I search for same domain name on http://www.register.com/index.rcmx, it gladly accepts the name while rejects non valid domain names like my#website.com.
Validation for URL/Domain using Regex? (Rails)
推荐答案
在域名中这是合法的，并且是国际化域名(IDN)所必需的IDN从Unicode转换为ASCII时最终以 xn开头
It's legal in a domain name, and required for internationalised domain names (IDNs) which when converted from Unicode to ASCII end up prefixed with xn--
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