Stanislaw Romanski wrote:
>  Hello,
>   
>  Please, consider the following short script.
>  #-----------------------------------------------------
>  $_ = '';
>   
>      s// /;      ## if any of these two lines is commented out,
>      s/ / /;     ## the printed result wil be ok, i.e. '= =' WHY ?
>   
>  $_ = '';
>  s// /;
>  print "=$_=\n";         ## prints incorrect '=='
>  #-----------------------------------------------------
>   
>  This was tested on Win'XT ActivePerl 5.8.8. and 5.8.9.
>   
>  What is wrong ?

If you check the perlop pod under s///, you should find this:
   "If the pattern evaluates to the empty string, the last
   successfully executed regular expression is used instead."
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