Using a module and a regex:
use Modern::Perl qw/2015/;
use File::Spec;

while ( my $fullfile = <DATA> ) {
    chomp $fullfile;
    my ( $volume, $directories, $file ) = File::Spec->splitpath($fullf
+ile);
    $file =~ /^([^.]+).*(\.[^.]+)/;
    say File::Spec->catpath( $volume, $directories, "$1$2" );
}

__DATA__
9781437706734\BODY\B978143770673410006X\B978143770673410006X.xml1.xml.
+xml
9781437706734\BODY\B9781437706734100010\B9781437706734100010.xml1.xml.
+xml
9781437706734\REAR\B9781437706734102000\B9781437706734102000.xml1.xml.
+xml
9781437706734\REAR\B9781437706734102050\B9781437706734102050.xml1.xml.
+xml
9781437706734\REAR\B9781437706734102051\B9781437706734102051.xml1.xml.
+xml
a\funny\file\path\with_too_many.file.extensions.in.the.file.name.txt

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CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

My blog: Imperial Deltronics

In reply to Re: To remove unwanted additional extension before the file extension using perl by CountZero
in thread To remove unwanted additional extension before the file extension using perl by codewalker

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