Stores a string in the database.

A built-in type that can be referenced via :string.

By default, values are trimmed and empty values are set to nil. You can use the allow_empty? and trim? constraints to change these behaviors.

Constraints

• :max_length (non_neg_integer/0) - Enforces a maximum length on the value

• :min_length (non_neg_integer/0) - Enforces a minimum length on the value

• :length_count - The unit used by min_length and max_length. Defaults to the unit implied by config :ash, :default_string_length_count (:codepoints, or :graphemes for :mixed).
  :graphemes matches String.length/1. :codepoints matches how most SQL data layers count string length. :bytes matches byte_size/1.
  A single grapheme may contain an unbounded number of codepoints (a base character followed by many combining marks), so :graphemes places no effective limit on the size of a value. Prefer :codepoints or :bytes when max_length is used as a storage or safety limit.
  Data layers cannot count graphemes, so with an explicit :graphemes the length constraints can only be applied to literal values, not atomically to expressions. Valid values are :graphemes, :codepoints, :bytes

• :match (Regex.t/0) - Enforces that the string matches a passed in regex

• :trim? (boolean/0) - Trims the value. The default value is true.

• :allow_empty? (boolean/0) - If false, the value is set to nil if it's empty. The default value is false.