print(   "1  " =~ /\d{0,3}/   ?"match":"no match", $/);
print(   "12 " =~ /\d{0,3}/   ?"match":"no match", $/);
print(   "  1" =~ /\d{0,3}/   ?"match":"no match", $/);
print(   "   " =~ /\d{0,3}/   ?"match":"no match", $/);