I found this page https://msdn.microsoft.com/en-us/library/bs2twtah.aspx
c# regex has an extension called balanced group. But I still cannot find how to match unbalanced group. Вс, 25 дек 2016, Raul Miller написал(а): > For that case, I'd code it in J, first, so that I could be sure it > works, and then translate that implementation to C#. > > I think regex is a red herring here, because (a) regular expressions > cannot handle parenthesis balancing by themselves, and (b) the regex > implementation which J uses does not have sufficient extensions to > overcome this difficulty. You could do it, with regex plus additional > wrapper code, but the resulting implementation would probably have > exponential performance problems in some cases. > > Thanks, > > -- > Raul > > > On Sun, Dec 25, 2016 at 11:43 AM, bill lam <[email protected]> wrote: > > In J602 windows front-end, it can high-light the unbalanced > > parenthesis, the example was taken from config/colorsmp.ijs > > using the JSample scheme. > > > > I think it should be efficient and not coded in J. > > An implementation in c/c# with regex would be appreciated. > > > > Вс, 25 дек 2016, Raul Miller написал(а): > >> Formally speaking, no, not using pure regular expressions by themselves. > >> > >> That said, it is possible to write a program which uses regular > >> expressions and a stack-like data structure to parse balanced > >> parenthesis. > >> > >> That said, for this problem, something based on +/\-/'()'=/y would > >> probably be more sensible. > >> > >> Do you need an implementation? > >> > >> Thanks, > >> > >> -- > >> Raul > >> > >> > >> On Sun, Dec 25, 2016 at 11:10 AM, bill lam <[email protected]> wrote: > >> > Season's Greetings! > >> > > >> > Is it possible to use regex to find the first index > >> > unmatched )( > >> > > >> > eg. for the line > >> > a + ((mno - rst) % b NB. unmatched paren > >> > ^ > >> > 01234 > >> > > >> > > >> > -- > >> > regards, > >> > ==================================================== > >> > GPG key 1024D/4434BAB3 2008-08-24 > >> > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > >> > gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 > >> > ---------------------------------------------------------------------- > >> > For information about J forums see http://www.jsoftware.com/forums.htm > >> ---------------------------------------------------------------------- > >> For information about J forums see http://www.jsoftware.com/forums.htm > > > > -- > > regards, > > ==================================================== > > GPG key 1024D/4434BAB3 2008-08-24 > > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > > gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
