=item Unknown switch condition (?(%s in regex; marked by <-- HERE in m/%s/
(F) The condition part of a (?(condition)if-clause|else-clause) construct
-is not known. The condition may be lookahead or lookbehind (the condition
-is true if the lookahead or lookbehind is true), a (?{...}) construct (the
-condition is true if the code evaluates to a true value), or a number (the
-condition is true if the set of capturing parentheses named by the number
-matched).
+is not known. The condition must be one of the following:
+
+ (1) (2) ... true if 1st, 2nd, etc., capture matched
+ (<NAME>) ('NAME') true if named capture matched
+ (?=...) (?<=...) true if subpattern matches
+ (?!...) (?<!...) true if subpattern fails to match
+ (?{ CODE }) true if code returns a true value
+ (R) true if evaluating inside recursion
+ (R1) (R2) ... true if directly inside capture group 1, 2, etc.
+ (R&NAME) true if directly inside named capture
+ (DEFINE) always false; for defining named subpatterns
The <-- HERE shows in the regular expression about where the problem was
discovered. See L<perlre>.
after an open brace in your pattern. Check the pattern and review
L<perlre> for details on legal verb patterns.
-first.
-
=item Unknown warnings category '%s'
(F) An error issued by the C<warnings> pragma. You specified a warnings
category that is unknown to perl at this point.
-Note that if you want to enable a warnings category registered by a module
-(e.g. C<use warnings 'File::Find'>), you must have imported this module
+Note that if you want to enable a warnings category registered by a
+module (e.g. C<use warnings 'File::Find'>), you must have loaded this
+module first.
=item unmatched [ in regex; marked by <-- HERE in m/%s/
compressed integer format and could not be converted to an integer.
See L<perlfunc/pack>.
-=item Unterminated verb pattern in regex; marked by <-- HERE in m/%s/
-
-(F) You used a pattern of the form C<(*VERB)> but did not terminate
-the pattern with a C<)>. Fix the pattern and retry.
-
-=item Unterminated verb pattern argument in regex; marked by <-- HERE in m/%s/
-
-(F) You used a pattern of the form C<(*VERB:ARG)> but did not terminate
-the pattern with a C<)>. Fix the pattern and retry.
-
=item Unterminated \g{...} pattern in regex; marked by <-- HERE in m/%s/
(F) You missed a close brace on a \g{..} pattern (group reference) in
not finding it. Chances are you left some needed parentheses out
earlier in the line, and you really meant a "less than".
+=item Unterminated verb pattern argument in regex; marked by <-- HERE in m/%s/
+
+(F) You used a pattern of the form C<(*VERB:ARG)> but did not terminate
+the pattern with a C<)>. Fix the pattern and retry.
+
+=item Unterminated verb pattern in regex; marked by <-- HERE in m/%s/
+
+(F) You used a pattern of the form C<(*VERB)> but did not terminate
+the pattern with a C<)>. Fix the pattern and retry.
+
=item untie attempted while %d inner references still exist
(W untie) A copy of the object returned from C<tie> (or C<tied>) was
If you need an empty attribute list, for example in a code generator, add
a space before the C<=>.
-=item Use of ?PATTERN? without explicit operator is deprecated
-
-(D deprecated) You have written something like C<?\w?>, for a regular
-expression that matches only once. Starting this term directly with
-the question mark delimiter is now deprecated, so that the question mark
-will be available for use in new operators in the future. Write C<m?\w?>
-instead, explicitly using the C<m> operator: the question mark delimiter
-still invokes match-once behaviour.
-
=item Use of freed value in iteration
(F) Perhaps you modified the iterated array within the loop?
otherwise reasonable constructs to fail in baffling ways. C<use strict;>
instead.
+=item Use of ?PATTERN? without explicit operator is deprecated
+
+(D deprecated) You have written something like C<?\w?>, for a regular
+expression that matches only once. Starting this term directly with
+the question mark delimiter is now deprecated, so that the question mark
+will be available for use in new operators in the future. Write C<m?\w?>
+instead, explicitly using the C<m> operator: the question mark delimiter
+still invokes match-once behaviour.
+
=item Use of qw(...) as parentheses is deprecated
(D deprecated) You have something like C<foreach $x qw(a b c) {...}>,