I want to create a Regex for url in order to get all links from input string.
The Regex should recognize the following formats of the url address:
http(s)://www.webpage.com
http(s)://webpage.com
www.webpage.com
and also the more complicated urls like:
- http://www.google.pl/#sclient=psy&hl=pl&site=&source=hp&q=regex+url&pbx=1&oq=regex+url&aq=f&aqi=g1&aql=&gs_sm=e&gs_upl=1582l3020l0l3199l9l6l0l0l0l0l255l1104l0.2.3l5l0&bav=on.2,or.r_gc.r_pw.&fp=30a1604d4180f481&biw=1680&bih=935
I have the following one
((www\.|https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+[\w\d:##%/;$()~_?\+-=\\\.&]*)
but it does not recognize the following pattern: www.webpage.com. Can someone please help me to create an appropriate Regex?
EDIT:
It should works to find an appropriate link and moreover place a link in an appropriate index like this:
private readonly Regex RE_URL = new Regex(#"((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+[\w\d:##%/;$()~_?\+-=\\\.&]*)", RegexOptions.Multiline);
foreach (Match match in (RE_URL.Matches(new_text)))
{
// Copy raw string from the last position up to the match
if (match.Index != last_pos)
{
var raw_text = new_text.Substring(last_pos, match.Index - last_pos);
text_block.Inlines.Add(new Run(raw_text));
}
// Create a hyperlink for the match
var link = new Hyperlink(new Run(match.Value))
{
NavigateUri = new Uri(match.Value)
};
link.Click += OnUrlClick;
text_block.Inlines.Add(link);
// Update the last matched position
last_pos = match.Index + match.Length;
}
I don't know why your result in match is only http:// but I cleaned your regex a bit
((?:(?:https?|ftp|gopher|telnet|file|notes|ms-help):(?://|\\\\)(?:www\.)?|www\.)[\w\d:##%/;$()~_?\+,\-=\\.&]+)
(?:) are non capturing groups, that means there is only one capturing group left and this contains the complete matched string.
(?:(?:https?|ftp|gopher|telnet|file|notes|ms-help):(?://|\\\\)(?:www\.)?|www\.) The link has now to start with something fom the first list followed by an optional www. or with an www.
[\w\d:##%/;$()~_?\+,\-=\\.&] I added a comma to the list (otherwise your long example does not match) escaped the - (you were creating a character range) and unescaped the . (not needed in a character class.
See this here on Regexr, a useful tool to test regexes.
But URL matching is not a simple task, please see this question here
I've just written up a blog post on recognising URLs in most used formats such as:
www.google.com
http://www.google.com
mailto:somebody#google.com
somebody#google.com
www.url-with-querystring.com/?url=has-querystring
The regular expression used is /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+#)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+#)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%#.\w_]*)#?(?:[\w]*))?)/ however I would recommend you got to http://blog.mattheworiordan.com/post/13174566389/url-regular-expression-for-links-with-or-without-the to see a complete working example along with an explanation of the regular expression in case you need to extend or tweak it.
The regex you give doesn't work for www. addresses because it is expecting a URI scheme (the bit before the URL, like http://). The 'www.' part in your regular expression doesn't work because it would only match www.:// (which is meaningless)
Try something like this instead:
(((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+)|(www\.)[\w\d:##%/;$()~_?\+-=\\\.&]*)
This will match something with a valid URI scheme, or something beginning with 'www.'
Related
I need to find the last two values at the end of such a string, "simple1" and "1.2-SNAPSHOT" in the sample url below. But my code below (try to get simple1/1.2-SNAPSHOT/) doesn't work, can anyone help?
http://localhost:8060/nexus/service/local/repositories/snapshots/content/org/sonatype/mavenbook/simple1/1.2-SNAPSHOT/
List<string> artifacts = new List<string>(); // this is already foler URL
// store all URLs to the artifacts be deleted
artifacts = nexusAPI.findArtifacts(repository, contents, days, pattern);
var regex = new Regex(".*\\/(.*\\/.*\\/)$");
foreach (string url in artifacts)
{
Console.WriteLine("group/artifact: {0}", regex.Matches(url));
}
I would just split the string on '/' and get the last two parts. The regex isn't going to do anything more then that.
If you must use RegEx, you're encountering an issue in that regexes are greedy - that means it puts as much in each .* as it possibly can. So your first step is to make the regex not greedy. Simply use this as your pattern:
(.*?)/
Here's a simple test showing how that this works.
This tells the regex to look for any character up to the slash, and then stop.
When you call Regex.Matches(url, "(.*?)/"), you will get returned an array of the matching data. From there, you can just look at the last two elements.
Of course, as SledgeHammer mentioned, this is one case where regex is unnecessary and even cumbersome. Simply working with url.Split(new char[] {'/'}) will give you the results you need.
I have a url something that follows a pattern as below :
http://i.ebayimg.com/00/s/MTUw12323gxNTAw/$(KGr123qF,!p0F123Q~~60_12.JPG?set_id=88123231232F
I need a regex to find and replace the end of the url _12.JPG with _14.JPG. So basically i need to capture the _[numbers only].JPG pattern and replace it with my value.
var regex = new Regex(#"_\d+\.JPG");
var newUrl = regex.Replace(url, "_14.JPG");
_[0-9]+\.JPG\?
works for the sample URL. You didn't really mention whether you wanted the
?set_id=88123231232F gone or not.
Basically, you shouldn't normally be concerned with periods anywhere else in the URL. It is possible, but the additional constraint of the jpg extension should limit anything returned with not much issue.
///_(\d?\d).jpg/ig
var regex = new Regex(#"_(\d?\d).[Jj][Pp][Gg]");
That will capture one or two numbers between an underscore and .jpg
I will double check this, but it should work for both one digit and two digits.
I'm sure this has been quite numerous times but though i've checked all similar questions, i couldn't come up with a solution.
The problem is that i've an input urls similar to;
http://www.justin.tv/peacefuljay
http://www.justin.tv/peacefuljay#/w/778713616/3
http://de.justin.tv/peacefuljay#/w/778713616/3
I want to match the slug part of it (in above examples, it's peacefuljay).
Regex i've tried so far are;
http://.*\.justin\.tv/(?<Slug>.*)(?:#.)?
http://.*\.justin\.tv/(?<Slug>.*)(?:#.)
But i can't come with a solution. Either it fails in the first url or in others.
Help appreciated.
The easiest way of parsing a Uri is by using the Uri class:
string justin = "http://www.justin.tv/peacefuljay#/w/778713616/3";
Uri uri = new Uri(justin);
string s1 = uri.LocalPath; // "/peacefuljay"
string s2 = uri.Segments[1]; // "peacefuljay"
If you insisnt on a regex, you can try someting a bit more specific:
Match mate = Regex.Match(str, #"http://(\w+\.)*justin\.tv(?:/(?<Slug>[^#]*))?");
(\w+\.)* - Ensures you match the domain, not anywhere else in the string (eg, hash or query string).
(?:/(?<Slug>[^#]*))? - Optional group with the string you need. [^#] limits the characters you expect to see in your slug, so it should eliminate the need of the extra group after it.
As I see it there's no reason to treat to the parts after the "slug".
Therefore you only need to match all characters after the host that aren't "/" or "#".
http://.*\.justin\.tv/(?<Slug>[^/#]+)
http://.*\.justin\.tv/(?<Slug>.*)#*?
or
http://.*\.justin\.tv/(?<Slug>.*)(#|$)
I'm trying to match and replace anchor tags using a regex. What i have so far is this:
"(<a href=['\"]?([\\w_\\.]*)['\"]?)"
The problem with this approach is that it fails to capture hrefs that also have # in their value. I've tried
"(<a href=['\"]?([\\w_\\.#]*)['\"]?)"
and
"(<a href=['\"]?([\\w_\\.\\#]*)['\"]?)"
with no success.
What am i doing wrong?
Thank you
I don't think the problem is with # (works fine for me) but with missing other url characters, such as -, /, : etc.
How about a regex like this:
<a href=("[^"]+"|'[^']+'|[^ >]+)
Note: If possible, use other parsing DOM methods for valid html.
If you just want to replace the anchor part use string operations. They are simpler and faster
var parts = "http://someurl.com#hashpart".Split("#");
// yields "http://someurl.com" and "hashpart" as array.
// you may want to check if the result has length of two
// if it does :
var newUrl = string.Format("{0}#{1}" parts[0], "some replacement for hashpart");
If your URL contains multiple hashes try using string.Substring to split at the first hashtag.
var url = "http://someurl.com#hash#hashhash";
var hashPos = url.IndexOf("#");
var urlPart = url.Substring(hashPos);
var hashPart = url.Substring(hashPos +1, url.length - hashPos -1);
Should work, wrote it without verification, maybe you have to toss around some +/- 1 to get the right positions.
<a href=(('|")[^\2]+?\2|[^>]+)
It would be great if someone could provide me the Regular expression for the following string.
Sample 1: <div>abc</div><br>
Sample 2: <div>abc</div></div></div></div></div><br>
As you can see in the samples provided above, I need to match the string no matter how many number of </div> occurs. If there occurs any other string between </div> and <br>, say like this <div>abc</div></div></div>DEF</div></div><br> OR <div>abc</div></div></div></div></div>DEF<br>, then the Regex should not match.
Thanks in advance.
Try this:
<div>([^<]+)(?:<\/div>)*<br>
As seen on rubular
Notes:
This only works if there are not tags in the abc part (or anything that has a < symbol).
You might want to use start and end of string anchors (^<div>([^<]+)(?:<\/div>)*<br>$ if you want your string to match the pattern exactly.
If you want to allow the abc part to be empty, use * instead of +
That being said, you should be wary of using regex to parse HTML.
In this example, you can use regex because you are parsing a (hopefully) known, regular subset of HTML. But a more robust solution (ie: an [X]HTML parser like HtmlAgilityPack) is preferred when it comes to parsing HTML.
You need to use a real parser. Things like infinitely nested tags can't be handled via regex.
You could also include a named group in the the expression, e.g.:
<div>(?<text>[^<]*)(?:<\/div>)*<br>
Implemented in C#:
var regex = new Regex(#"<div>(?<text>[^<]*)(?:<\/div>)*<br>");
Func<Match, string> getGroupText = m => (m.Success && m.Groups["text"] != null) ? m.Groups["text"].Value : null;
Func<string, string> getText = s => getGroupText(regex.Match(s));
Console.WriteLine(getText("<div>abc</div><br>"));
Console.WriteLine(getText("<div>123</div></div></div></div></div><br>"));
NullUserException's answer is good. Here are a couple of questions, and variations, depending on what you want.
Do you want to prevent anything from occurring before the open div tag? If so, keep the ^ at the beginning of the regex. If not, drop it.
The rest of this post refers to the following section of the regex:
([^<]+?)
Do you want to capture the contents of the div, or just know that it matches your form? To capture, leave it as is. If you don't need to capture, drop the parentheses from the above.
Do you want to match if there is nothing inside the div? If so change the + in the above to *
Finally, although it will work fine, you don't need the ? in the above.
I think, this regex is more flexible:
<div\b[^><]*+>(?>.*?</div>)(?:\s*+</div>)*+\s*+<br(?:\s*+/)?>
I don't include the ^ and $ in the beginning and the end of my regex because we cannot assure that your sample will always in a single line.