bash-3.00# /usr/local/bin/perl -e 'my $value="12MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="1MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="122MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
122
bash-3.00# /usr/local/bin/perl -e 'my $value="22MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="22.MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="22.5MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
22.5
bash-3.00# /usr/local/bin/perl -e 'my $value="22MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="22M"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="22MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
0
bash-3.00# /usr/local/bin/perl -e 'my $value="22MB"; if($value=~/([0-9]+.+[0-9]+)(.*)/){print $1."\n"; }else{ print "0\n";}'
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