C# – Getting “Unterminated [] set.” Error in C#

cregex

I am working with following regex in C#

Regex find = new Regex("[,\"]url(?<Url>[^\\]+)\\u0026");

and getting this error:

"System.ArgumentException: parsing "[,"]url([^\]+)\u0026" - Unterminated [] set.

I'm kind of new to regular expressions so correct me if I'm wrong. The regular expression is supposed to extract urls from text matching like:

,url=http://domain.com\u0026

"url=http://hello.com\u0026

Best Answer

You need to use a verbatim string:

Regex find = new Regex(@"[,""]url(?<Url>[^\\]+)\\u0026");

Edit: However, I'd change the regex to

Regex find = new Regex(@"(?<=[,""]url=)[^\\]+(?=\\u0026)");

Then the entire match is the URL itself. No need for a capturing sub-group.

Related Solutions

Regex to match URL end-of-line or “/” character

To match either / or end of content, use (/|\z)

This only applies if you are not using multi-line matching (i.e. you're matching a single URL, not a newline-delimited list of URLs).

To put that with an updated version of what you had:

/(\S+?)/(\d{4}-\d{2}-\d{2})-(\d+)(/|\z)

Note that I've changed the start to be a non-greedy match for non-whitespace ( \S+? ) rather than matching anything and everything ( .* )

Javascript – How to extract base URL from a string in JavaScript

Edit: Some complain that it doesn't take into account protocol. So I decided to upgrade the code, since it is marked as answer. For those who like one-line-code... well sorry this why we use code minimizers, code should be human readable and this way is better... in my opinion.

var pathArray = "https://somedomain.com".split( '/' );
var protocol = pathArray[0];
var host = pathArray[2];
var url = protocol + '//' + host;

Or use Davids solution from below.

Best Answer

Related Solutions

Regex to match URL end-of-line or “/” character

Javascript – How to extract base URL from a string in JavaScript

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