in reply to Looking for white spaces between words
Second, you want to make a substitution. Enter $var =~ s/.../.../;. Now we have this: $foo =~ s/( +)//;. We just need to come up with something to substitute in there.
Well, you want for each space, so we want it repeated for the length of the spaces: " " x length $1.
Now to add that to our regular expression. The trick is to use the /e and /g modifiers, which interpret the second half of the substitution as an expression and substitute globally. $foo =~ s/( +)/" " x length $1/ge And that's it! You're done!
Hope this helps,