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Re: The default hash - accident, coincidence or conspiracy?

by tlm (Prior)
on Jun 20, 2005 at 12:34 UTC ( #468310=note: print w/ replies, xml ) Need Help??


in reply to The default hash - accident, coincidence or conspiracy?

From perlop (my added emphasis):

Perl variable names may also be a sequence of digits or a single punctuation or control character. These names are all reserved for special uses by Perl; for example, the all‐digits names are used to hold data captured by back references after a regular expression match...

Finally, new in Perl 5.6, Perl variable names may be alphanumeric strings that begin with control characters (or better yet, a caret). These variables must be written in the form "${^Foo}"; the braces are not optional. "${^Foo}" denotes the scalar variable whose name is a con≠trol−"F" followed by two "o"ís. These variables are reserved for future special uses by Perl, except for the ones that begin with "^_" (control−underscore or caret−underscore). No control‐character name that begins with "^_" will acquire a special meaning in any future version of Perl; such names may therefore be used safely.

the lowliest monk


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