regular expression as lua pattern
Dear list, I have the following sample: \starttext \startTEXpage[pagestate=start, offset=1em] \startluacode local str = "this is that" context(str:match("(this|these)")) \stopluacode \stopTEXpage \stoptext In short, I would like to know whether it is possible to have the regular expression (this|these) as a Lua pattern. I mean, I need complete strings and I haven’t found the way to do it. Many thanks for your help, Pablo
Hi Pablo, unfortunately, that it is not possible: http://lua-users.org/wiki/PatternsTutorial, section Limitations. The best, Tomáš On Tue, May 28, 2024 at 06:12:51PM +0200, Pablo Rodriguez via ntg-context wrote:
Dear list,
I have the following sample:
\starttext \startTEXpage[pagestate=start, offset=1em] \startluacode local str = "this is that" context(str:match("(this|these)")) \stopluacode \stopTEXpage \stoptext
In short, I would like to know whether it is possible to have the regular expression (this|these) as a Lua pattern.
I mean, I need complete strings and I haven’t found the way to do it.
Many thanks for your help,
Pablo ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
On 5/28/24 18:25, Tomáš Hála wrote:
Hi Pablo,
unfortunately, that it is not possible:
http://lua-users.org/wiki/PatternsTutorial, section Limitations.
Many thanks for your reply, Tomáš. It is clear to me now. Pablo
On 5/28/2024 6:25 PM, Tomáš Hála wrote:
Hi Pablo,
unfortunately, that it is not possible:
http://lua-users.org/wiki/PatternsTutorial, section Limitations.
\starttext \startTEXpage[pagestate=start, offset=1em] \startluacode local pat = (lpeg.Cmt(lpeg.P("this") + lpeg.P("that"), function(str,_,s) context(s) return #str end) + lpeg.P(1))^1 lpeg.match(pat,"how about this being that") local pat = (lpeg.Cmt(lpeg.oneof({ "this", "that" }), function(str,_,s) context(s) return #str end) + lpeg.P(1))^1 lpeg.match(pat,"how about this being that") \stopluacode \stopTEXpage \stoptext
On Tue, May 28, 2024 at 06:12:51PM +0200, Pablo Rodriguez via ntg-context wrote:
Dear list,
I have the following sample:
\starttext \startTEXpage[pagestate=start, offset=1em] \startluacode local str = "this is that" context(str:match("(this|these)")) \stopluacode \stopTEXpage \stoptext
In short, I would like to know whether it is possible to have the regular expression (this|these) as a Lua pattern.
I mean, I need complete strings and I haven’t found the way to do it.
Many thanks for your help,
Pablo ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
-- ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------
Am 28.05.24 um 20:06 schrieb Hans Hagen:
On 5/28/2024 6:25 PM, Tomáš Hála wrote:
Hi Pablo,
unfortunately, that it is not possible:
http://lua-users.org/wiki/PatternsTutorial, section Limitations.
\starttext \startTEXpage[pagestate=start, offset=1em] \startluacode local pat = (lpeg.Cmt(lpeg.P("this") + lpeg.P("that"), function(str,_,s) context(s) return #str end) + lpeg.P(1))^1 lpeg.match(pat,"how about this being that")
local pat = (lpeg.Cmt(lpeg.oneof({ "this", "that" }), function(str,_,s) context(s) return #str end) + lpeg.P(1))^1 lpeg.match(pat,"how about this being that") \stopluacode \stopTEXpage \stoptext
See also Taco’s introduction to LPEG in https://articles.contextgarden.net/journal/2019/77-98.pdf Hraban
On 5/29/24 13:00, Henning Hraban Ramm wrote:
[...] See also Taco’s introduction to LPEG in https://articles.contextgarden.net/journal/2019/77-98.pdf
Many thanks for the reference, Hraban. I need to start digesting that to learn about LPEG. Pablo
On 5/28/24 20:06, Hans Hagen wrote:
On 5/28/2024 6:25 PM, Tomáš Hála wrote:
Hi Pablo,
unfortunately, that it is not possible:
http://lua-users.org/wiki/PatternsTutorial, section Limitations.
\starttext \startTEXpage[pagestate=start, offset=1em] \startluacode local pat = (lpeg.Cmt(lpeg.P("this") + lpeg.P("that"), function(str,_,s) context(s) return #str end) + lpeg.P(1))^1 lpeg.match(pat,"how about this being that")
local pat = (lpeg.Cmt(lpeg.oneof({ "this", "that" }), function(str,_,s) context(s) return #str end) + lpeg.P(1))^1 lpeg.match(pat,"how about this being that") \stopluacode \stopTEXpage \stoptext
Many thanks for your reply, Hans. I will have to study it becasue LPEGs is new stuff for me. Many thanks for your help, Pablo
participants (4)
-
Hans Hagen -
Henning Hraban Ramm -
Pablo Rodriguez -
Tomáš Hála