Author: lwall Date: 2010-04-15 19:47:19 +0200 (Thu, 15 Apr 2010) New Revision: 30393
Modified: docs/Perl6/Spec/S05-regex.pod Log: [S05] say what happens with negative quantifier ranges Modified: docs/Perl6/Spec/S05-regex.pod =================================================================== --- docs/Perl6/Spec/S05-regex.pod 2010-04-15 14:44:59 UTC (rev 30392) +++ docs/Perl6/Spec/S05-regex.pod 2010-04-15 17:47:19 UTC (rev 30393) @@ -928,6 +928,21 @@ =item * +Negative range values are allowed, but only when modifying a reversible +pattern (such as C<after> could match). For example, to search the +surrounding 200 characters as defined by 'dot', you could say: + + / . ** -100..100 <element> / + +Similarly, you can back up 50 characters with: + + / . ** -50 <element> / + +[Conjecture: A negative quantifier forces the construct to be +considered procedural rather than declarational.] + +=item * + C<< <...> >> are now extensible metasyntax delimiters or I<assertions> (i.e. they replace Perl 5's crufty C<(?...)> syntax).
