Apply restrictions on property by validating the characters length

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Hi,

I'm trying to display an error when the technician enters defined number of characters on string property type.

for example: i have property "Update Apartment address" and i want to restrict the technician from entering more than 20 characters ( numbers, Alphabetic and symbols).

I tried to use “this > 20” in the Validation field but it validate only numbers. it didn’t work,

Any idea how I can achieve this