Agreed, it works exactly as r.joseph presented it. However you may want to think about using 
$str =~ s/ +/_/g;

[download]
instead, since it doesn't mess with your newline characters. That is, with your version "perl\n" becomes "perl_".

- Boldra

In reply to Re: Re: Replacing multiple spaces into one character? by Boldra
in thread Replacing multiple spaces into one character? by r.joseph

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