randAlpha

These four functions generate cryptographically secure (uses crypto/rand) random strings, but with different base character sets:

• randAlphaNum uses 0-9a-zA-Z
• randAlpha uses a-zA-Z
• randNumeric uses 0-9
• randAscii uses all printable ASCII characters

Each of them takes one parameter: the integer length of the string.

randNumeric 3

The above will produce a random string with three digits.