From: "David A. Black" <dblack@...>
Date: 2008-05-01T06:40:09+09:00
Subject: Re: Search string for occurneces of words stored in array

Hi --

On Thu, 1 May 2008, Robert Klemme wrote:

> On 30.04.2008 16:18, Jens Wille wrote:
>> Phillip Gawlowski [2008-04-30 16:09]:
>>> John Butler wrote:
>>> | Hi,
>>> |
>>> | I have a sentence "This is my test sentence" and an array["is", "the",
>>> | "my"] and what i need to do is find the occurence of any of thearray
>>> | words in the sentence.
>>> |
>>> | I have this working in a loop but i was wondering is there a way to do
>>> | it using one of rubys string methods.
>>> |
>>> | Its sililar to the include method but searching for multiple words not
>>> | just one.
>>> |
>>> | "This is my test sentence".include?("This") returns true
>>> |
>>> | but i want something like
>>> |
>>> | "This is my test sentence".include?("This", "is", "my")
>>> |
>>> | anyone got a nice way to do this? I only need to find if one of the
>>> | words occure and then i exit.
>>> |
>>> | JB
>>> 
>>> How about '["is", "the", "my"].each'?
>>> 
>>> I.e.:
>>> 
>>> ["is", "the", "my"].each do |word|
>>> ~  break if "the test sentence'.include? word
>>> end
>> i'd prefer Enumerable#any?:
>>
>>   sentence, words = "This is my test sentence", ["This", "is", "my"]
>>   words.any? { |word| sentence.include?(word) }
>
> I'd rather do it the other way round, i.e. iterate over the sentence and test 
> words since the sentence is potentially longer:
>
> irb(main):001:0> require 'enumerator'
> => true
> irb(main):002:0> require 'set'
> => true
> irb(main):003:0> words = %w{This is my}.to_set
> => #<Set: {"my", "This", "is"}>
> irb(main):004:0> "This is my test sentence".to_enum(:scan,/\w+/).any? {|w| 
> words.include? w}
> => true
> irb(main):005:0>

Is there any reason not to just do:

   "This is my test sentence".scan(/\w+/).any? {|w| words.include? w }


David

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