英文:
How to accept port number in this regex?
问题
这是URL验证的正则表达式：
/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/
这部分代码可以保持不变。如果要修改以接受端口号，您可以尝试以下正则表达式：
/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})(:[0-9]+)?([\/\w \.-]*)*\/?$/
这将允许匹配带有端口号的URL，例如：http://localhost:3000。
英文:
This is url validation regex
/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/
This works Okay.
However if I type url with port number such as http://localhost:3000, it gives an error.
How can I change this expression to accept a port number as well?
答案1
得分: 3
https?：这部分匹配URL的协议部分。s是可选的，因此它匹配http和https。
:\/\/：这匹配协议中的冒号和两个正斜杠。
(?:w{1,3}\.)?：这匹配可选的www子域（如果存在）。(?: )创建一个非捕获组，{1,3}量词匹配1到3个"w"字母。
[^\s.]+：这匹配域名，由一个或多个不是空格或点的字符组成。
(?:\.[a-z]+)*：这匹配在域名之前可能存在的任何可选子域，以点分隔。(?: )创建另一个非捕获组，*量词匹配零个或多个该组的实例。[a-z]+匹配一个或多个小写字母。
(?::\d+)?：这匹配可能在域名之后出现的可选端口号，由冒号前缀。(?: )创建另一个非捕获组，?量词使其可选。:匹配冒号，\d+匹配一个或多个数字。
(?![^<]*(?:<\/\w+>|\/?>))：这是一个负向先行断言，确保URL不是HTML标签的一部分。它检查URL之前是否没有与模式(?:</\w+>|/?>)匹配的字符，该模式匹配任何闭合的HTML标签或空标签。
英文:
Please can try this one
https?:\/\/(?:w{1,3}\.)?[^\s.]+(?:\.[a-z]+)*(?::\d+)?(?![^<]*(?:<\/\w+>|\/?>))
https?: This part matches the protocol of the URL. The s is optional, so it matches both http and https.
:\/\/: This matches the colon and two forward slashes that are part of the protocol.
(?:w{1,3}\.)?: This matches the optional www subdomain, if it exists. The (?: ) creates a non-capturing group, and the {1,3} quantifier matches between 1 and 3 instances of the letter "w".
[^\s.]+: This matches the domain name, which consists of one or more characters that are not whitespace or a dot.
(?:\.[a-z]+)*: This matches any optional subdomains that come before the domain, separated by dots. The (?: ) creates another non-capturing group, and the * quantifier matches zero or more instances of this group. The [a-z]+ matches one or more lowercase letters.
(?::\d+)?: This matches an optional port number that might come after the domain, preceded by a colon. The (?: ) creates another non-capturing group, and the ? quantifier makes it optional. The : matches the colon, and \d+ matches one or more digits.
(?![^<]*(?:<\/\w+>|\/?>)): This is a negative lookahead that ensures that the URL is not part of an HTML tag. It checks if there are no characters before the URL that match the pattern (?:<\/\w+>|\/?>), which matches any closing HTML tag or an empty tag.
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