How to get all substrings from captured groups in regex in Vala? - regex

Question

I am writing an aplication in Vala that uses regex. What I need to do is wrap all hashtags in string in tags. And I don't quite understand how regex works in Vala.
Currently I am trying to do something like this:
Regex hashtagRegex = new Regex("(#[\\p{L}0-9_]+)[ #]");
MatchInfo info;
if (hashtagRegex.match_all_full(string, -1, 0, 0, out info))
{
foreach(string hashTag in info.fetch_all())
string = string.replace(hashTag, "" + hashTag + "");
}
but it parses only first hashtag and with the space on the end of it.
I am using [ #] at the end of the regex because some users don't separate hashtags with spaces and just write bunch of hashtags like this: #hashtag1#hashtag2#hashtag3 and I want to handle it too.
What I need to do is to somehow get an array of all hashtags in string to use it to wrap all of them in tags. How can I do it?

Answer 1

What I need to do is to somehow get an array of all hashtags in string to use it to wrap all of them in tags. How can I do it?
No it isn't.
Try something like this:
private static int main (string[] args) {
try {
GLib.Regex hashtagRegex = new GLib.Regex ("#([a-zA-Z0-9_\\-]+)");
string res = hashtagRegex.replace_eval ("foo #bar baz #qux qoo", -1, 0, 0, (mi, s) => {
s.append_printf ("%s", mi.fetch (1), mi.fetch (0));
return false;
});
GLib.message (res);
} catch (GLib.Error e) {
GLib.error (e.message);
}
return 0;
}
I don't know what characters are valid in a hash tag, but you can always tweak the regex as needed. The important part is using a callback to perform the replacement.