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I'm looking for a .NET regular expression extract all the URLs from a webpage but haven't found one to be comprehensive enough to cover all the different ways you can specify a link.
And a side question:
Is there one regex to rule them all? Or am I better off using a series of less complicated regular expressions and just using mutliple passes against the raw HTML? (Speed vs. Maintainability)
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HTML is not a regular language and hence cannot be parsed by regular expressions. Regex queries are not equipped to break down HTML into its meaningful parts.
$/; var url= content. match(urlR);
$ means "Match the end of the string" (the position after the last character in the string).
Regex isn't suited to parse HTML because HTML isn't a regular language. Regex probably won't be the tool to reach for when parsing source code. There are better tools to create tokenized outputs. I would avoid parsing a URL's path and query parameters with regex.
((mailto\:|(news|(ht|f)tp(s?))\://){1}\S+)
I took this from regexlib.com
[editor's note: the {1} has no real function in this regex; see this post]
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