From: "David A. Black" <dblack@...>
Date: 2008-12-05T04:09:13+09:00
Subject: Re: reg exp

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Hi --

On Fri, 5 Dec 2008, Jes=FAs Gabriel y Gal=E1n wrote:

> On Thu, Dec 4, 2008 at 3:34 AM, Hai anh Le <lhanh@wichiptech.com> wrote:
>> I have a problem with regexp. I have some document like :
>>
>> A method for detecting a post-translationally modified protein with a
>> glycosyl group comprising contacting the protein with a glycosyl
>> transferase enzyme and a labeling agent, wherein the labeling agent
>> comprises a chemical handle and a transferable glycosyl group.
>>
>> I want to divide it to some string follow a rule that string start with
>> "a, an, the" like :
>>
>> "A method for detecting "
>> "a post-translationally modified protein with "
>> "a glycosyl group comprising contacting "
>> "the protein with "
>> "a glycosyl transferase enzyme and "
>> "a labeling agent, wherein "
>> "the labeling agent comprises "
>> "a chemical handle and "
>> "a transferable glycosyl group."
>
> I though of split, but then you get an array entry for the "separator"
> and the following part, so you would need to paste them again
> yourself:
>
> irb(main):008:0> a =3D "A method for detecting a post-translationally
> modified protein with a glycosyl group comprising contacting the
> protein with a glycosyl transferase enzyme and a labeling agent,
> wherein the labeling agent comprises a chemical handle and a
> transferable glycosyl group."
> =3D> "A method for detecting a post-translationally modified protein
> with a glycosyl group comprising contacting the protein with a
> glycosyl transferase enzyme and a labeling agent, wherein the labeling
> agent comprises a chemical handle and a transferable glycosyl group."
> irb(main):011:0> require 'enumerator'
> =3D> true
> irb(main):012:0> result =3D []
> =3D> []
> irb(main):015:0> a.split(/\b(a|an|the)\b/i)[1..-1].each_slice(2) {|a,
> b| result << (a+b)}
> =3D> nil
> irb(main):016:0> result
> =3D> ["A method for detecting ", "a post-translationally modified
> protein with ", "a glycosyl group comprising contacting ", "the
> protein with ", "a glycosyl transferase enzyme and ", "a labeling
> agent, wherein ", "the labeling agent comprises ", "a chemical handle
> and ", "a transferable glycosyl group."]
>
> Maybe someone can come with a split solution easier to join?

Try this:

   a.split(/(?=3Dan?\b|the\b)/i)


David

--=20
Rails training from David A. Black and Ruby Power and Light:
INTRO TO RAILS (Jan 12-15), Fort Lauderdale, FL
See http://www.rubypal.com for details
Coming in 2009: The Well-Grounded Rubyist (http://manning.com/black2)
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