-(W ambiguous) You wrote something like C<${foo[2]}>, which might be
-looking for element number 2 of the array named C<@foo>, in which case
-please write C<$foo[2]>, or you might have meant to pass an anonymous
-arrayref to the function named foo, then do a scalar deref on the
-value it returns. If you meant that, write C<${foo([2])}>.
+(W ambiguous) You wrote something like C<${foo[2]}> (where foo
+represents the name of a Perl keyword), which might be looking for
+element number 2 of the array named C<@foo>, in which case please write
+C<$foo[2]>, or you might have meant to pass an anonymous arrayref to
+the function named foo, and then do a scalar deref on the value it
+returns. If you meant that, write C<${foo([2])}>.
+
+In regular expressions, the C<${foo[2]}> syntax is sometimes necessary
+to disambiguate between array subscripts and character classes.
+C</$length[2345]/>, for instance, will be interpreted as C<$length>
+followed by the character class C<[2345]>. If an array subscript is what
+you want, you can avoid the warning by changing C</${length[2345]}/>
+to the unsightly C</${\$length[2345]}/>, by renaming your array to
+something that does not coincide with a built-in keyword, or by
+simply turning off warnings with C<no warnings 'ambiguous';>.
https://perl5.git.perl.org / perl5.git / blobdiff