How to write this regex to export links

Question

Here the example.

Starts with : imgurl= Ends with : &amp

Example extraction

asfasfasfasimgurl=http://www.mysite.com&ampasgasgas

Result: http://www.mysite.com

So how can I write regex to extract all instances like this?

What have you tried? What if there are multiple occurrences of `imgurl=` or `$amp`? From first to last, from first to first, from last to first, from last to last? Provide some more examples and your own attempt, please. — Martin Ender, Jul 03 '13 at 19:31
@m.buettner thanks for answer. instead of thinking too much pattern for this particular example may work for me. I am also trying myself right now. — Furkan Gözükara, Jul 03 '13 at 19:32

score 2 · Accepted Answer · edited May 23 '17 at 12:05

2

You can use lookbehind and lookahead

 (?<=imgurl=).*?(?=&amp)

You can get a list of urls using

 List<String> urls=Regex.Matches(input,regex)
                        .Cast<Match>()
                        .Select(x=>x.Value)
                        .ToList();

edited May 23 '17 at 12:05

Community

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answered Jul 03 '13 at 19:34

Anirudha

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thanks a lot working awesome can you please explain it to me i also want to learn how to right regex :D – Furkan Gözükara Jul 03 '13 at 19:44
2

@MonsterMMORPG then [this tutorial](http://regular-expressions.info/tutorial.html) is what you want to read ;) – Martin Ender Jul 03 '13 at 19:49

score 2 · Answer 2 · edited May 23 '17 at 12:28

2

A simple regex could be:

(?:imgurl=)(.*)(?:&amp)

the (?:[stuff here]) is a non-capture group. It requires the pattern to match, but not capture/extract. The (.*) captures everything in-between the two non-capture groups.

Also to learn more about capture groups you can read here What is a non-capturing group? What does a question mark followed by a colon (?:) mean?

edited May 23 '17 at 12:28

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answered Jul 03 '13 at 19:51

Nick Humrich

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How to write this regex to export links

2 Answers2