This can be made even simpler. Remember that if a character is listed in a tr/// searchlist more than once, only the first occurance is meaningful. This means you can do something like:
$string =~ tr/\n\000-\037/\n/d;
(Note I'm using octal here). This specifies that the newline character is replaced by itself, while everything else in that range is deleted.
There are three advantages to this method:
It's (IMHO) cleaner and easier to read.
It's easier to modify, e.g. to exempt additional characters from being deleted.
It doesn't care what character is used for newline on the current platform. For example, I seem to remember that \n and \r have their meanings reversed on one platform (Macintosh?) because the platform standard is to use CR for line breaks.
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Want more info? How to link
or How to display code and escape characters
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