Double-quoted strings are very similar to C with many special characters given in table 2-1 of Llama book and online PERL man page. (See later in foils)
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Examples: \n is newline, \t is tab and \cC is Control-C
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Example: 'Hello
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World' is equivalent to "Hello\nWorld"
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Note \L instructs PERL that all following characters until a \E are to be interpreted as lower case
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\U ... \E is similar but intervening characters are upper case
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A critical feature of double-quoted strings is that they "interpolate" variables (e.g., with $ as initial character). For this reason use \$ to denote a literal dollar sign in a double-quoted string.
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Variables are NEVER interpolated in single-quoted strings
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