Generate an Array of Random Strings

This routine will generate a random string sequence consisting of the same number of characters and/or numbers as specified by the dimension input.

The calling syntax consists of a desired array dimension followed by the singleton dimension identifier such as:

strchar = randstr(dim,dim3);

where dim represents the dimensions of the character output array, strchar and dim3 specifies which dimension determines the string.

Example function call:
>> strchar = randstr([2 5],2,'useWildCards',false);
>> strchar = 2×5 char array
'TXdaE'
'fxCPo'

There are four optional argument inputs which can be either boolean or integer values. These input arguments determine the requirements of the randomly generated character string:

- useDigits specifies how many numbers to use in the randomly generated string of length dim(dim3)

- useWildCards specifies how many wild card characters to use in the randomly generated string of length dim(dim3)

- useLowerCase specifies how many lower case characters to use in the randomly generated string of length dim(dim3)

- useUpperCase specifies how many upper case characters to use in the randomly generated string of length dim(dim3)