Javascript regex for validating url

I did make one change: the "-*" in both domain and host was (incorrectly) succeeding against " so I changed it to "-? However it will be very easy to add 'localhost' as an acceptable exception. :\.\d))" 'IP address dotted notation octets 'excludes loopback network 'excludes reserved space = 'excludes network & broacast addresses '(first & last IP address of each class) rxs = rxs "(? $_iu S I have added simple network ranges validation, the rules I used are: - valid range -, network adresses above and including are reserved addresses - first and last IP address of each class is excluded since they are used as network broadcast addresses since I don't think this is worth implementing completely in a regular expression, a following pass should exclude the Intranet address space: - - 1.255 - the loopback and the automatic configuration address space: - - while the local, multicast and and the reserved address spaces: - (SPECIAL-IPV4-LOCAL-ID-IANA-RESERVED) - 239.255.255 (MCAST-NET) - (SPECIAL-IPV4-FUTURE-USE-IANA-RESERVED) should already be excluded by the above regular expression. Negative lookahead is used instead NOTE, that package does fuzzy search, not strict validation. If they copy it out and back into a browser so they may not know what's wrong with it upon visual inspection. What I can see is that browsers accept that but then they insert a slash in it when finished.

This a very minimal list of tests to add to your testings: PASS " " " FAIL " " " " " Need testing :) Need to mention I took the idea of validating the possible IP address ranges in the URL while looking at other developers regular expressions I have seen in your tests, especially the one from @scottgonzales. In that network, and are two valid and usable address. " (string contains double quotes) ' (string contains single quote) [ (string contains brackets) here is JS demo with full unicode support, including astral characters. Src is here: Since astral characters take 2 positions, [^negative] class is impossible. some=query while they may not technically be valid, it is something I could see a user typing and most browsers will fix it for them. The only pattern it won't match for me (Using it in a Java Regex) is where the IP address is '0'(ZERO) padded, like: I get as input from other tools. Public Sub Match Url(url As String) Dim rxs As String = "" 'protocol identifier rxs = rxs "(? Hi, is a valid URL but the last dot ist usually not written by convention. works in Firefox and IE Just a small comment about brodcast and network address. Ex: If a provider have two class like and, they can combine the two in a classless network: Of course, internally, the regex should first be run 'greedily' to check if there's a possible match by making sure required letters are there.. but in the end, you are giving 'better instructions' to the javascript engine. They are related to having/allowing a trailing dot at the end of the hostname. It's this simple format that will cause the problem: m) times which has that letter matching. You're almost forced to be more declarative when you don't use the negative lookaheads... URI producers should provide these registered names in the IDNA encoding, rather than a percent-encoding, if they wish to maximize interoperability with legacy URI resolvers." So, UTF-8 characters other than alphanumeric characters should be represented using % encoding and IDNA encoding. This is an answer to @halloamt & @muessigb questions. though the complexity for this rises as the nested groups become more complex Finally, I think this can be fixed here, by changing the host name from: There's no need to add non-capturing groups if you're not doing anything with the group... for -* (in both host and domain) to allow for as many hyphens in between letters. As you can see from the previous message I recently allowed it in my regular expression. Essentially, if I were to write the implementation for a regex, when encountering such a group, I would internally be doing this: because first I'm doing a positive lookahead to check if this is even possible... That's why I liked this better (for the host/domain/tld): Note that this is the same as what I posted above, with the exception of switching out the -? I answered to this question previously on Twitter, here is an interesting link with additional info: The title of the article say it all: "The danger of the trailing dot in the domain name". In the list of URLs failing validation that you sent above only the first one is a valid URL (" all the others are not validating against the regex. I am most likely inclined to also remove IPV4 validation from the base regex, nobody remember these numbers and they will most likely change in time. " " " " " " " " " " " " " " " Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" q=Spaces should be encoded") Ok @form Validators.uri("//") Ok @form Validators.uri("//a") Ok @form Validators.uri("///a") Ok @form Validators.uri("///") Ok @form Validators.uri(" Ok @form Validators.uri("") Ok @form Validators.uri("rdar://1234") Ok @form Validators.uri("") Ok @form Validators.uri(":// should fail") Ok @form Validators.uri(" quux") Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" Ok @form Validators.uri(" @dsgn1graphics, I suggest you check your tests and/or the port of the Regular Expression you are currently using. However I disagree about having patterns that will never be typed by users like "IPV6" and "Puny Code". It is easy to just remove the unwanted parts of the validation to fit different scopes (length, precision) so I will probably add more options like the list of existing TLD (possibly grouped), the list of existing protocols and/or a fall back for a more generic protocol match too. my Java Script URI parsing library does strict URI validation as per RFC 3986. The second validation block also takes care of excluding IP address terminating with 0 or 255 (non usable network and broadcast addresses of each class C network).

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