[erlang-questions] Problems with re:replace/4

[Antoine Koener]

Whenever you deal with re module and the \ character, try \\ instead.

There's 2 levels of filtering.

Maybe this will help :))



On 22 juil. 2011, at 09:39, Paul Burt <paul.burt@REDACTED> wrote:

> Hi,
> 
> I'm a newcomer to Erlang and am interested in writing some helper
> functions to parse and manipulate responses from the Twitter API for
> use in a web application.
> 
> What I would like to do is replace "@mention" and "#hashtag" with HTML
> markup as follows:
> 
> @mention --> <a href="http://twitter.com/mention">@mention</a>
> #hashtag --> <a href="http://search.twitter.com/search?tag=hashtag">#hashtag</a>
> 
> In other words transform Twitter @mentions and #hashtags into clickable links.
> 
> I have the basic structure of a function (tweetify/1) to do this
> below. The ???? represent where I'm running into trouble:
> 
> tweetify(Input) ->
>    Replacements = [
>        {"@(?<mention>\\w+)", "<a href=\"http://twitter.com/????\">&</a>"},
>        {"#(?<hashtag>\\w+)", "<a
> href=\"http://search.twitter.com/search?tag=????\">&</a>"}
>    ],
>    lists:foldl(fun({RE, Replacement}, Tweet) ->
>                      re:replace(Tweet, RE, Replacement, [global,
> {return, binary}])
>                  end, Input, Replacements).
> 
> Whilst I understand that the token "&" will insert _everything_
> matched by the regular expression (i.e. @mention and #hashtag
> respectively), how do I use the named tags in the replacement string?
> In other words, how do I get hold of \k<mention> and \k<hashtag> in
> the PCRE idiom and use them in the replacement string?
> 
> Thanks in advance for any assistance/pointers.
> 
> -Paul
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