From: "David A. Black" <dblack@...>
Date: 2005-04-28T11:10:53+09:00
Subject: Re: Scanning a String

Hi --

On Thu, 28 Apr 2005, Nicholas Seckar wrote:

> On 4/27/05, basi <basiibarra@yahoo.com> wrote:
>> Hello,
>> How do I scan a string for a pattern and process it when found? For
>> example:
>>
>> for all occurrences of two vowel letters in succession, insert the
>> apostrophe between the vowels.
>
> some_string.gsub(/([aeiou])([aeiou])/) {|match| $1 + "'" + $2}

(You don't really need the block arg (match) :-)

Just to add a possible variant: depending how you want to handle three
or more vowels in a row, you might want to do:

   pious".gsub(/([aeiou])(?=[aeiou])/) { "#{$1}'#{$2}" }

which will result in:  pi'o'us

(I thought there was a [[:vowel:]] POSIX character class but
apparently not.)


David

-- 
David A. Black
dblack@wobblini.net