regex - Regular Expression to accept all the decimals from 0 to 100

Question

I want to modify my existing Regular Expression which accepts decimals from 0 to 99.99

d{0,2}(.d{1,2})?$ 

i want this to be accept

100
100.0
100.00

and should not accept

100.1
100.02
101

Can anyone help me modify the above RE

Answer 1

I guess it's best to add the test for 100 as a special case using |:

^(d{0,2}(.d{1,2})?|100(.00?)?)$