On Saturday, 20 September 2014 at 15:28:54 UTC, seany wrote:
consider this:
import std.conv, std.algorithm;
import core.vararg;
import std.stdio, std.regex;
void main()
{
string haystack = "ID : generateWorld;
Position : { &
{ID : \" absolute ; Coordinate : , NULL OMEGA;}
{ID : \" inclusion ; Coordinate : UNDEF;}
{ID : \" subarc; Coordinate : , NULL OMEGA; }
}; ID : ";
// thus, something like *{B}* can not end here,
// but something like X can start here.
string needle =
"(?<!(([.\n\r])*(\\{)([.\n\r])*))(ID(\\p{White_Space})*:(\\p{White_Space})*)(?!(([.\n\r])*(\\})([.\n\r])*))";
auto r = regex(needle, "g");
auto m = matchAll(haystack, r);
foreach (c; m)
writeln(c.hit);
}
So let us break up needle:
(
?<!
(
([.\n\r])*(\\{)([.\n\r])*
)
)
Do not match somthing, that may contain a "*{*" as a leading
match, * this time means any character, including \n and \r
(ID(\\p{White_Space})*:(\\p{White_Space})*)
however, look for the form : "ID" <few blank spaces> ":" < more
blank spaces>
(?!(([.\n\r])*(\\})([.\n\r])*))
but no trailing "*}*" as a trailing match.
In haystack, there are two such "ID :" -s. once at the
beginning, ID : generateWorld. and then the final, last ID
However, this is returning all 5 ID-s as match
what am I doing wrong?
Is this string a JSON string? if so, why not use a proper JSON
parsing library?
as other already mentioned, this kind of data isn't good to parse
using regex... write small routines to parse that data instead
of. It isn't more hard than make it working using regexp.
Seriously.
