transform the numbers to letters using php

^[a-z]+\.?[a-z]+[0-9]*$

  ^                        the beginning of the line
  [a-z]+                   any character of: 'a' to 'z' (1 or more times)
  \.?                      '.' (optional)
  [a-z]+                   any character of: 'a' to 'z' (1 or more times)
  [0-9]*                   any character of: '0' to '9' (0 or more times)
  $                        the end of the line

> import Data.Char(ord,toUpper)
> map (\x -> ord (toUpper x) - ord 'A' + 6) "Hi"
[13,14]

private string RandomString()
        {
            var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            var numbers = "0123456789";
            var stringChars = new char[8];
            var random = new Random();

            for (int i = 0; i < 2; i++)
            {
                stringChars[i] = chars[random.Next(chars.Length)];
            }
            for (int i = 2; i < 6; i++)
            {
                stringChars[i] = numbers[random.Next(numbers.Length)];
            }
            for (int i = 6; i < 8; i++)
            {
                stringChars[i] = chars[random.Next(chars.Length)];
            }

            var finalString = new String(stringChars);
            return finalString;
        }

...
order by binary replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(
  name, '0', 'a'), '1', 'b'), '2', 'c'), '3', 'd'), '4', 'e'), '5', 'f'), '6', 'g'), '7', 'h'), '8', 'i'), '9', 'j')

SELECT _id,Example FROM mytable WHERE Example; 

public Cursor showRecordsFromExample(){
    String[] selectedColumn = new String[]{_id, KEY_EXAMPLE};
    Cursor selectedCursor = sqLiteDatabase.query(MYDATABASE_TABLE, selectedColumn,
            null, null, null,
            null, null);
    return selectedCursor;
}

public Cursor showRecordsFromExample(){
    String[] selectedColumn = new String[]{_id, KEY_EXAMPLE};
    Cursor selectedCursor = sqLiteDatabase.query(MYDATABASE_TABLE, selectedColumn,
            KEY_EXAMPLE + " LIKE '%a%'", null, null,
            null, null);
}