How can I do so that it only allows me to add a single decimal digit, that is, limit the decimal value to a single digit. And if the user enters more than one decimal value, for example 5.45, it cannot and is restricted to a single decimal value after the comma.

On input, the basic numeric formats accept positive and numbers in standard decimal notation or scientific notation. Leading and trailing spaces are allowed. An empty or all-spaces field, or one that contains only a single period, is treated as the system missing value.

In scientific notation, the exponent may be introduced by a sign (‘+’ or ‘-’), or by one of the letters ‘e’ or ‘d’ (in uppercase or lowercase), or by a letter followed by a sign. A single space may follow the letter or the sign or both.