Doubts on char patterns into String.each argument

[Carlos Ortega]

Hello Folks with a question I would like someone can clarify me:

When I type the following code:

"Substring1 Substring2 Substring3".each( '\s*' ) { | substring |
puts "[" + substring +"]"
}

What I got is:

[Substring1 ]
[Substring2 ]
[Substring3]


However when I type:

"Substring1 Substring2 Substring3".each( '\s*' ) { | substring |
puts "[" + substring +"]"
}

What I got is:

[Substring1 Substring2 Substring3]


Why the difference in outputs?
I verified in the "Programming Ruby 2nd (Dave Thomas - 2005)"
and it says that the ' ' is just one of the White Characters
that '\s' may represent ( the other ones are TAB and NEW LINE)

Any help would be very appreciated.

 

[Nobuyoshi Nakada]

Hi,

At Mon, 6 Aug 2007 08:43:07 +0900,
Carlos Ortega wrote in [ruby-talk:263437]:

When I type the following code:

"Substring1 Substring2 Substring3".each( '\s*' ) { | substring |
puts "[" + substring +"]"
}

What differs?

However when I type:

"Substring1 Substring2 Substring3".each( '\s*' ) { | substring |
puts "[" + substring +"]"
}

 

[dblack]

Hi --

"Substring1 Substring2 Substring3".each( '\s*' ) { | substring |
puts "[" + substring +"]"
}

In ruby, if you want something to be interpreted as a regular expression,
you must declare it as a regular expression. Hence /\s*/ would be
correct. Except that each() only accepts strings, so you can't use a
regular expression with it.

Use
"Substring1 Substring2 Substring3".split(/\s+/).each{|x| puts x}
instead

You could also just do:

puts "Substring1 Substring2 Substring3".split(' ')

You could even leave off the (' '), except then if $; has a value
you'd end up splitting on that.


David

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