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  1. or download this
    
$orig='aaa([\+\-]{1})bbb';
...
$str=$orig;
$str =~ s!$bre!!;
print "Replace against variable bslashed => $bre <=: $str\n";
  2. or download this
    c:\temp> D:\perl58\bin\perl.exe re.pl
 D:\perl58\bin\perl.exe re.pl
...
This is perl, v5.6.1 built for MSWin32-x86-multi-thread
(with 1 registered patch, see perl -V for more detail)