#           delimiters
#             |  |  |
#             v  v  v
$localdir =~ s/\//\\/g;
#              ^^ ^^
#              |   |
#    search part   replacement

##</code><code>##

#           delimiters
#             |  |  |
#             v  v  v
$localdir =~ s/\\/\//g;
#              ^^ ^^
#              |   |
#    search part   replacement

##</code><code>##

#           delimiters
#             |  ||  |
#             v  vv  v
$localdir =~ s{/}{\\}g;
#              ^  ^^
#              |   |
#    search part   replacement

##</code><code>##

<c>
#           delimiters
#             |  ||  |
#             v  vv  v
$localdir =~ s{\\}{/}g;
#              ^^  ^
#              |   |
#    search part   replacement