Not quite. Putting \\\n into a character class causes every occurrence of either a backslash or a newline to be removed. This results in a file consisting of just a single line, which is not what is wanted. Remove the character class:
my $file = '';
$file .= $_;
second line \
third line \
13:10 >perl 738a_SoPW.pl
second line third line fourth line
Note that the substitution operates on each line of input in turn, and a single input line can contain no more than one backslash-newline sequence. So, the /g modifier is not needed.
Hope that helps,
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