How to put Validations for mentioned conditions

Input fields in Appian have a validations parameter exactly made for this case.

Thank you for the update Stefan

Yeah within in the Validation parameter trying to build logic for the above scenarios but not working so need suggestion on applying logic to show validation if above scenarios doesn't match means

Can you share what you tried so far?

Hello dharanik2600,

you can create an expression rule by designing your logic. You can try using the regex function and predetermine your required format and call this rule in your input validation parameter. I hope this is what you are asking about. 

Hi Stefan,

please find the below sample which i tried so far

a!localVariables(
local!input: "P.1234567.89",
local!pattern:"^P\\.\\d{7}\\.\\d{2}$",
local!isvalid: if(
regexmatch(local!input,local!pattern),
true(),
false
),
local!isvalid
) 

Hi Stefan,

please find the below sample which i tried so far

a!localVariables(
local!input: "P.1234567.89",
local!pattern:"^P\\.\\d{7}\\.\\d{2}$",
local!isvalid: if(
regexmatch(local!input,local!pattern),
true(),
false
),
local!isvalid
) 

Could be slightly simplified. As for the regex, really recommend you try out ChatGPT or going on a regex forum for additional help.

a!localVariables(
  local!input: "P.1234567.89",
  local!pattern:"^P\\.\\d{7}\\.\\d{2}$",
  local!isvalid: regexmatch(local!input,local!pattern),
  local!isvalid
)