I want to put a condition that text field only accept Hebrew charecter,

You could add a validation to check that all characters are Hebrew. I think there is no need for any regex.

https://unicode-table.com/en/blocks/hebrew/

This snippet checks whether a given string only consists of valid characters.

a!localVariables(
  local!string: "abcx",
  local!valid: "abc",
  len(cleanwith(local!string, local!valid)) = len(local!string)
)

Hi,

Thank you for quick response,

So The way You sugeested, do I need to put all 112 hebrew charecter in one string one by one?   

If the characters are in a contiguous unicode range then you could write an expression to automate this. 

If the characters are in a contiguous unicode range then you could write an expression to automate this.