Andreas Pokorny wrote:
Hi Eric,
Eric Niebler wrote:
(Sorry for the delay, I just got back from a week-long vacation.)
Andreas Pokorny wrote:
Do you see a nicer solution? Hi Andreas. I *also* recently made nested regexes work for dynamic regexes, and I made an announcement about it on this list not too long ago. See here: http://lists.boost.org/Archives/boost/2007/06/122641.php.
Oh dear, I switched from my old gmx email account to the gmail based for boost, there are still 7k unread boost messages.
I guess you've got some reading to do. ;-)
In particular, see "Dynamic Regex Grammars with Named Regexes", which has the following example:
sregex_compiler comp; sregex rx = comp.compile("^bar(?$RE)baz$"); comp.compile("(?$RE=)\\d+ \\d+");
The regex_compiler holds a map from names to regex objects. The first call to compile() creates a forward reference to a regex object named "RE" and the second call binds a regex to the name "RE".
Is this the sort of thing you had in mind? (This is only available in the repository -- no public release has this feature yet.)
(?$ looks like an assertion. I wanted to use that feature to implement configureable/extensible syntax highlighting withing quickbook. What happens if you add RE regex line e.g. comp.compile("(?$RE=)\\w+ ");
You mean add that line after the other two? It should replace the meaning of (?$RE) in all the regexes that refer to $RE. The syntax is something I made up and is evocative of a Perl variable assignment.
Did you consider a different syntax for specifiying named regular expressions, or is (?$=) and (?$) something that exists in other regex engine?
I made that syntax up and I'm not attached to it. I don't know of any prior art in this area, except that design work for Perl 6. I don't recall not what they're using or why I didn't go with it. :-P Can you suggest a better syntax? -- Eric Niebler Boost Consulting www.boost-consulting.com The Astoria Seminar ==> http://www.astoriaseminar.com