[Vala] Regular expression literals for Vala

[jp0409 jippii fi]

Hi,

I have written a patch that adds regular expression literal support for 
Vala. See more details in

https://bugzilla.gnome.org/show_bug.cgi?id=607702

The following example demonstrates the feature:

-----------

using GLib;


static int main (string[] args)
{
       MatchInfo info;

       // Simple greedy regular expression matching.
       var str1 = "mississippi";
       if (@/(is.*ip)/.match (str1, 0, out info)) {
stdout.printf ("Part of %s is '%s'...\n", str1, info.fetch (1));
       } else {
               stdout.printf ("Did not match at all.\n");
       }

       // Match caseless.
       var str2 = "demonStration";
       if (@/mon(str.*o)n/i.match (str2, 0, out info)) {
stdout.printf ("Part of %s is '%s'...\n", str2, info.fetch (1));
       } else {
               stdout.printf ("%s did not match at all.\n", str2);
       }

       // Match and pick substrings.
       var ts   = "Time: 10:42:12";
       if (@/Time: (..):(..):(..)/.match (ts, 0, out info)) {
stdout.printf ("%s\n\thours = %s\n\tminutes = %s\n\tseconds = %s\n\n", 
ts, info.fetch (1), info.fetch (2), info.fetch (3));
       }

       // Replace demo: word swapping
       try {
               var str = "apple grape";
stdout.printf ("'%s' becomes '%s'\n", str, @/^([^ ]*) *([^ ]*)/.replace 
(str, -1, 0, """\2 \1"""));
       } catch (RegexError err) {
               // Replacing still needs exception catching
               message (err.message);
       }

       return 0;
}

----

Any comments welcome.

Regards,
JP

__
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