validation for textfied

Question

for the text field need to give validation, when user enters the value along with text,number,special character then need to show the validation like only alpha/letters 
 but how can i show this, text field will allow alpha numeric and special character as well

Konduru Chaitanya · Accepted Answer

if(
 lower(ri!text) = cleanwith(
 lower(ri!text),
 "abcdefghijklmnopqrstuvwxyz"
 ),
 "",
 "Accpets only Alphabets"
) 
 Add the alphabets to a constant and replace the string with constant. Create a expression rule and call it as required.

validation for textfied

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