[NTG-context] Re: regular expression as lua pattern

[Hans Hagen <j.hagen@xs4all.nl>]

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
> ___________________________________________________________________________________

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___________________________________________________________________________________
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
___________________________________________________________________________________