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MathGroup Archive 2005

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Re: refering to a long pattern by a variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57752] Re: [mg57713] refering to a long pattern by a variable
  • From: yehuda ben-shimol <bsyehuda at gmail.com>
  • Date: Tue, 7 Jun 2005 02:04:04 -0400 (EDT)
  • References: <200506060821.EAA12505@smc.vnet.net>
  • Reply-to: yehuda ben-shimol <bsyehuda at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi
First you need to recognize that the full form of ___  is 
BalnkNullSequence[].
The ~~ operator is StingExpression[]
generate a function (not a clever one, but it will demonstrate the
idea and easily can be modified)
makePat[s_String]:=StringExpression @@ (Insert[Characters[s],
BlankNullSequence[], 2])
then

txt="abcbacabzzcz";
StringCases[txt, ShortestMatch[makePat["bc"]], Overlaps -> False]
will return the answer you need. You can call makePat with any string
you need (of two characters).
yehuda
On 6/6/05, marloo3 at mail15.com <marloo3 at mail15.com> wrote:
> hello
> i wish if i could refer to a long pattren by just a variable,
> suppose the:
> txt="abcbacabzzcz";
> and the pattern to search is "b"~~___~~"c"
> StringCases[txt, ShortestMatch["b" ~~ ___ ~~ "c"], Overlaps -> False]
> Out[]={bc, bac, bzzc}
> ok, i hope there is a way to supply just the :
> pat=Characters["bc"];
> and some procedure will make the "b" ~~ ___ ~~ "c" from the above pat variable
> and assign this pattern to pat2 variable so we just write:
> StringCases[txt,
> ShortestMatch[pat2], Overlaps -> False]
> to give the output
> Out[]={bc, bac, bzzc}
> i have tried it by StringJoin but it does not work.
> thanks
> 
> 
>


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