I frequently rely on two documentation mechanisms when I want to use regular expressions in J:
(*) open 'regex' -- this lets me read the comments while looking at the definitions. The exported names begin with rx, and rxmatches is one of the mechanisms I reach for most often. J's open verb might only work in jqt? (*) pcre documentation. J's regexp implementation uses the pcre implementation of regular expressions. Google helps here. (Other search providers like Bing might also help, but their management often knows better than me what it is that I am interested in, which I find confusing.) Beyond that, experimentation helps, quite a lot (including looking at shapes and partial results when things get big). FYI, -- Raul On Sun, Mar 6, 2022 at 12:13 PM 'Michael Day' via Programming <programm...@jsoftware.com> wrote: > > I forgot about regular expressions in J, but not familiar with them anyway! > Used to know them in unix, once upon a time. > Yr commas much better, too. > > M > > On 06/03/2022 17:02, Raul Miller wrote: > > Here's a version of getoeisseries which only returns direct hits and > > not cross references: > > > > NB. install 'web/gethttp' > > require'regex web/gethttp' > > > > OEIS =: 'http://oeis.org/search?q=' NB. fails with https://... ! > > > > getoeisseries=: {{ > > a0=. I.'<a 'E.RAW=:gethttp OEIS,commas y > > a1=. I.'</a>'E.RAW > > A=. ,{."1'href="/A\d{6}"'rxmatches RAW > > a=. RAW{L:0~(a0(+i.)&.>a1-a0){~<:a0 I.A > > keep=. -.(1: e. ' title=' E. ])S:0 a > > >(}.~1+i.&'>')&.> keep#a > > }} > > > > commas=: rplc&' ,_-'@": > > > > FYI, > > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
