Author: larry Date: Tue Aug 15 08:40:59 2006 New Revision: 10969 Modified: doc/trunk/design/syn/S02.pod
Log: Explicitly outlawed \123 and the like. Modified: doc/trunk/design/syn/S02.pod ============================================================================== --- doc/trunk/design/syn/S02.pod (original) +++ doc/trunk/design/syn/S02.pod Tue Aug 15 08:40:59 2006 @@ -12,9 +12,9 @@ Maintainer: Larry Wall <[EMAIL PROTECTED]> Date: 10 Aug 2004 - Last Modified: 14 Aug 2006 + Last Modified: 15 Aug 2006 Number: 2 - Version: 64 + Version: 65 This document summarizes Apocalypse 2, which covers small-scale lexical items and typological issues. (These Synopses also contain @@ -1365,11 +1365,25 @@ =item * -Characters indexed by hex, octal, and decimal numbers can be interpolated -into strings using either C<"\x123"> (with C<\o> and C<\d> behaving -respectively) or using square brackets: C<"\x[123]">. Multiple -characters may be specified within any of the bracketed forms by -separating the numbers with comma: C<"\x[41,42,43]">. +Characters indexed by hex numbers can be interpolated into strings +by introducing with C<"\x">, followed by either a bare hex number +(C<"\x263a">) or a hex number in square brackets (C<"\x[263a]">). +Similarly, C<"\o12"> and C<"\o[12]"> interpolate octals, while +C<"\d1234"> and C<"\d[1234]"> interpolate decimals--but generally +you should be using hex in the world of Unicode. Multiple characters +may be specified within any of the bracketed forms by separating the +numbers with comma: C<"\x[41,42,43]">. You must use the bracketed +form to disambiguate if the unbracketed form would "eat" too many +characters, because all of the unbracketed forms eat as many characters +as they think look like digits in the radix specified. None of these +notations work in normal Perl code. They work only in interpolations +and regexes and the like. + +The old C<\123> form is now illegal, as is the C<\0123> form. +Only C<\0> remains, and then only if the next character is not in +the range C<'0'..'7'>. Octal characters must use C<\o> notation. +Note also that backreferences are no longer represented by C<\1> +and the like--see S06. =item *
