need regular expression from 1 to 20 with 2 floating point number

I need some help for an regular expression for numbers between 1 and 20 with 2 floating point number in c# ? examples : 5 , 6.5 , 7.75 , 10 , 12.3 , 19.99 far i got to this ^(?:[1-9][0-9]?|20)[.]?0*(?:[1-9][0-9]?)?$ but it`s not working and its accepting more than 20 to, so according to […]

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