string

• The field under validation must be a string. If you would like to allow the field to also be null, you should assign the nullable rule to the field.

  data = %{
   user_name1: "john_007",
   user_name2: 1879,   ---> return error
  }
  rules = [
    %{
      field: "user_name1",
      validate: ["string"]
    },
   %{
      field: "user_name2",
      validate: ["string"]
    }
  ]

alpha

• The field under validation must be entirely alphabetic characters.

  data = %{
   p1: "John Doe",
   p1: "James 007",   ---> return error
  }
  rules = [
    %{
      field: "p1",
      validate: ["alpha"]
    },
   %{
      field: "p2",
      validate: ["alpha"]
    }
  ]

start_with:foo

• The field under validation must start with the given values.

data = %{
    start_code: "G123other_string",
    start_code2: "other_string". ---> return error
  }
rules = [
    %{
      field: "start_code",
      validate: ["start_with:G123"]
    },
    %{
      field: "start_code2",
      validate: ["start_with:Me32"]
    }
]

end_with:foo

• The field under validation must end with the given values

  data = %{
    end_code: "other_stringG123",
    end_code2: "other_string". ---> return error
  }
  rules = [
    %{
      field: "end_code",
      validate: ["end_with:G123"]
    },
    %{
      field: "end_code2",
      validate: ["end_with:Me32"]
    }
  ]