If u wish you can try this code

$sequence='
1
sen
192
gube
433
siva
raj
280
shank
prasad
600
san
zia
753';


$START1 =  1; $STOP1 = 280;
$START2 =  192; $STOP2 =  433; 
$START3 = 600; $STOP3 = 753;



for $k(1..3)
{
$s='START'."$k";
$en='STOP'."$k";
    
 print "******start****";
(@arr)=$sequence=~m#$$s(.*?)$$en#gsi;
 $ar = join(" ", @arr);
 $ar=~s/\d//gi;
 $ar=~s/\n+/\n/gi;
 print "$ar"; 
 print "******end***\n";
}
[download]

output:
******start****
sen
gube
siva
raj
******end***
******start****
gube
******end***
******start****
san
zia
******end***