On 16.07.2011 10:17, dsmith wrote:
Could you demonstrate how to use std.regex for pattern matching, preferably
with a bool method?
My usage of std.regex.match yields this error:
core.exception.AssertError@/usr/include/d/dmd/phobos/std/regex.d(1796):
4294967295 .. 4294967295 vs. 5
My usage is: auto m = match(long_string, regex(str));
writeln(m.hit);
Your and apparently an awful lot of people hit this, the thing is that
.hit method is returning _matched slice_ of string if there is a match
and asserts otherwise. (there is also issue of this assert having
message is of a _very_ poor quality)
As it stands now regex works like ranges: you need to check if it was
empty then use it, so if all you want to do is a test:
auto m = match(long_string, regex(str));
writeln(!m.empty); // substitute for "there was match"
Thinking more about this, it should be in synopsis part of std.regex in
docs on d-p-l.org. Along with something like:
foreach(m; match("abc", regex("\w", "g")) //uses range syntax to iterate
over all matches (so empty is checked)
writeln(m.hit); // here m.hit is guaranteed to hold something (and
not asserting)
== Repost the article of Jonathan M Davis ([email protected])
== Posted at 2011/07/16 01:08 to digitalmars.D.learn
On�Saturday�16�July�2011�05:07:38�dsmith�wrote:
�Until�recently,�you�could�easily�use�std.regexp.search(target_string,
�find_string),�but�regexp�is�apparently�no�longer�in�phobos.��I�seek�a
�simple�substitute.��std.algorithm.canFind�might�work,�as�it�is�bool.
�Maybe�try�something�like:
�foreach(str;�strings)
�����foreach(fls;�system_files)
���������if(std.algorithm.canFind(fls,�str))���//�usage�needs�verification
str�~=�".ext";
std.regex�is�std.regexp's�replacement.
-�Jonathan�M�davis
--
Dmitry Olshansky
