Regular expression doesn't translate from Javascript to C#?

Question

I have a pretty easy (imo) Regular expression which doesn' translate to C#. RegExr says it works, however testing it in C# doesn't work... Do I need to change anything to make it work in C#?

RegEx:

/https://subdomain[.1]domain[.1]com/(.*)(ashx|axd)/g

Replace:

http://subdomain.domain.com/$1$2

Input string:

<script src="https://subdomain.domain.com/ScriptResource.axd?d=SQ032obz8ZDKgHbn6XZ3X4xN0iWznAgAxgrdjOtFjVj-yUo-Lk-c2r4ciOs2uasdfjiemr4ciOs2uaGYfeYrYGiemnAQT9UzGoQVKs_JPL8l7TA1LjPYKexOcr4ciOs2uar4ciOs2uaHgpZf-tDxkb_le2NhBN0&amp;t=ffffffffb868b5f4" 
type="text/javascript"></script><script type="text/javascript">
//<![CDATA[
Sys.Application.initialize();
//]]>
</script>

bad!!! bad!! your target string contains / (in http://)!! escape them!! — Shai
– Shai, Commented Feb 23, 2012 at 15:18
You know, that you cannot use / in a regex without escaping them, or using different delimiters, right? — knittl
– knittl, Commented Feb 23, 2012 at 15:19
Can you post your C# code? The regex you've given wouldn't work either as the // following the protocol specifier would only parse as a single / for the regex I believe. There's plenty of documentation on the .Net Regex class and how to use it. Unfortunately Regex isn't a language in itself and has different implementations on pretty much every platform. — Lazarus
– Lazarus, Commented Feb 23, 2012 at 15:20
To be honest, you seem to replace https with http. Why don't you just do that? Why the other matching? Or do you want to extract the url? What is the desired output? — BlueM
– BlueM, Commented Feb 23, 2012 at 15:28
@Shai, @knittl, @Lazarus: the // isn't the problem and still works. It was the / and /g at beginning and end that caused the problem. — ReFocus
– ReFocus, Commented Feb 23, 2012 at 15:57

BlueM · Accepted Answer · 2012-02-23 16:23:54Z

2

Your regex shouldnt contain / and /g. And instead [.1] write .

As I suspect you only want to change https into http you can just do that:

s = s.Replace("https:", "http:");

In case you want to replace the domain you can do that with regex:

  s = Regex.Replace(s, "https://[^/]+", "http://yourreplaced.domain.com", RegexOptions.Multiline);

edited Feb 23, 2012 at 16:23

answered Feb 23, 2012 at 15:18

BlueM

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4 Comments

ReFocus Over a year ago

This works indeed! The [.1] is still valid and didn't have to be replaced. However don't I need the /g to make it replace all occurrences?

ReFocus Over a year ago

I don't need the /g however I do need the [.1]!

BlueM Over a year ago

Show your desired output and I can help you further.

BlueM Over a year ago

Added a regex for you. Hope it helps.

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