title: regex expression for number only between 1-24 and also allow decimal
body: <p>i want regex expression which allow only numbers between 1-24 and also 2 decimal numbers.
  should allow following numbers
  1
  2
  3
  .
  .
  24
  and 
  1.00
  1.01
  1.02
  .
  .
  24.99</p>