$: - Perldoc Browser

#IO::Handle->format_line_break_characters EXPR

#$FORMAT_LINE_BREAK_CHARACTERS

#$:

The current set of characters after which a string may be broken to fill continuation fields (starting with ^) in a format. Default is " \n-", to break on whitespace or hyphens. (Mnemonic: a "colon" in poetry is a part of a line.)

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