Limbo Peng <iwi...@gmail.com> writes: > On Sat, Dec 29, 2012 at 1:22 AM, Mark H Weaver <m...@netris.org> wrote: > > Regular expression syntax is not standardized, and there are > several > different variants. The "\d" syntax for character classes is a > non-standard perl extension, and is not supported by Guile. > > > Thx...seems that I've been taking such syntax for granted for a long > time :( > > BTW: I've found a module called pregexp which looks more powerful - > does it work well in Guile?
First, I should note that any regexp matcher written in Scheme will be much slower than the one built-in to Guile (which is written in C). There are some additional problems with pregexp. It does not appear to be written with Unicode in mind, and is also written in such a way that it will probably perform quite poorly on future versions of Guile. If you'd like a more advanced regexp library, and don't mind the fact that it will be much slower than Guile's built-in regexps, I recommend that you look at Alex Shinn's irregex package: http://synthcode.com/scheme/irregex/ Irregex is written with Unicode in mind, and supports not only perl-style regexps, but also Olin Shivers' SRE (Scheme Regular Expression) syntax, which is a far superior notation for complex or dynamically-constructed regexps. http://www.ccs.neu.edu/home/shivers/papers/sre.txt Regards, Mark
