Yes. This might be what you mean:

$string =~ s/\n//;
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That will remove the first newline it sees. When mixing platforms you might have to deal with \r also. If you want to remove all the newlines add a g switch:

$string =~ s/\n//g;
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Consider replacing the newline with something smaller, like a space.

So newline is a single character (at least on unix) and you can match it with \n.

Phil

Update: Hue-Bond pointed out an error in wording. The issue with \r arrises when you process a file on a different system than the one that generated it. Generally \n will match whatever the native new line combination is, but it will not necessarily match if the file came from a foreign system.