print for map{ 
    /(\D+)?(\d+)-\1?(\d+)/ 
    ? ( map{ ($1||'') . $_ } $2 .. $3 ) 
    : $_ 
} split ';', 'ph1-3;25;t3;t47-t50;d4-6';;
ph1
ph2
ph3
25
t3
t47
t48
t49
t50
d4
d5
d6