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
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This example might get you started.
https://docs.appian.com/suite/help/24.2/recipe-add-multiple-validation-rules-to-one-component.html#goal
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.