On 19.03.2012 17:27, Jay Norwood wrote:
On Monday, 19 March 2012 at 08:05:18 UTC, Dmitry Olshansky wrote:
Like I told in main D group it's wrong - regex doesn't only count
matches. It finds slices that do match.
Thus to make it more efficient, it returns lazy range that does
searches on request. "g" - means global :)
Then code like this is cool and fast:
foreach(m; match(input, ctr))
{
if(m.hit == "magic we are looking for")
break; // <<< ---- no greedy find it all syndrome
}
ok, global. So the document implies that I should be able to get a
single match object with a count of the submatches. So I think maybe
I've jumped to the wrong conclusion about how to use it, thinking I
could just use "\n" and "g" flag got get all the matches for the range
of "\n". So it looks like instead that the term "submatches" needs more
explanation. What exactly constitutes a submatch? I infered it just
meant any single match among many.
Maybe a replacement of submatch ---> capture helps. But I thought it was
easy to get that any subexpression in regex e.g. "(\w+)" is captured
into submatch. Are you aware sub-expressions in regex are also extracted
from the text?
//create static regex at compile-time, contains fast native code
enum ctr = ctRegex!(`^.*/([^/]+)/?$`);
//works just like normal regex:
auto m2 = match("foo/bar", ctr); //first match found here if any
assert(m2); // be sure to check if there is a match, before examining
contents!
assert(m2.captures[1] == "bar");//captures is a range of submatches, 0 -
full match
BTW, In the above example what captures are should be clearly visible.
btw, I couldn't get this \p option to work for the uni properties. Can
you provide some example of that which works?
\p{PropertyName} Matches character that belongs to unicode PropertyName
set. Single letter abreviations could be used without surrounding {,}.
Ouch, I see that docs are no good :)
But well, they are reference-like anyway, you might want to take a look
for more healthy and lengthy overview:
http://blackwhale.github.com/regular-expression.html
--
Dmitry Olshansky
