How to put validation on decimal precision ?

Question

HI All, 
 I have a text field which takes decimal values , i want to restrict(put validation) the field with precision of 22 which means user is allowed to enter 13 digits before decimal and 9 digits after decimal point not more than that . Also, i want to store the value as it is (no round off) . 
 Please can somebody help me with this .

Thanks in advance.

papreed0001 · Answer

Hi Anu, 
 We have a function called fixed(). This function has number and decimals( The number of digits after the decimal that will be maintained. 2 by default) fields. 
 refer documentation here: fixed function 
 example: fixed(7.36819, 3) returns 7.368 
 In your case : fixed(ri!enteredValue, 9)

ManuelHTG · Answer

I would do an expression rule that receives a text and do the checks making use of the following supporting functions: 
 split() - to find separate the arrays before and after the decimal point 
 lenght() to see the number of numbers on each of the arrays returned from split 
 Then I would stored as a text to make sure you dont lose precision