redo
- redo
The
redo
command restarts the loop block without evaluating the conditional again. Thecontinue
block, if any, is not executed. If the LABEL is omitted, the command refers to the innermost enclosing loop. Programs that want to lie to themselves about what was just input normally use this command:# a simpleminded Pascal comment stripper # (warning: assumes no { or } in strings) LINE: while (<STDIN>) { while (s|({.*}.*){.*}|$1 |) {} s|{.*}| |; if (s|{.*| |) { $front = $_; while (<STDIN>) { if (/}/) { # end of comment? s|^|$front\{|; redo LINE; } } } print; }
redo
cannot be used to retry a block which returns a value such aseval {}
,sub {}
ordo {}
, and should not be used to exit a grep() or map() operation.Note that a block by itself is semantically identical to a loop that executes once. Thus
redo
inside such a block will effectively turn it into a looping construct.See also continue for an illustration of how
last
,next
, andredo
work.