Awesome

RandomStringGenerator

A module to generate a random string based on a given string pattern

Installation

The package can be installed by adding random_string_generator to your list of dependencies in mix.exs:

def deps do
  [
    {:random_string_generator, "~> 1.0.0"}
  ]
end

Usage

Accepted string patterns:

Use l for lower case letter from a to z

Use L for upper case letter from A to Z

Use d for digit from 0 to 9

Use p for punctuation

Use c for custom character

Punctuation is any character on the following group:

!, ", #, $, %, &, ', (, ), *, +, ,, -, ., /, :, ;, <, =, >, ?, @, [, \, ], ^, _, {, |,}, ~ and `

Generate a string containing 2 lower case letters followed by 2 digits.

iex> RandomStringGenerator.generate("lldd")
"ol68"

Generate a string containing 2 upper case letters.

iex> RandomStringGenerator.generate("LL")
"VR"

Generate a string containing 2 punctuations.

iex> RandomStringGenerator.generate("pp")
"?!"

Delimiters

Everything that is not l,L,d,p and c is treated as a delimiter so the pattern -dl? is interpreted as a hyphen followed by a digit followed by a lower case letter followed by a question mark.

Generate a string containing 2 letters followed by a hyphen.

iex> RandomStringGenerator.generate("ll-")
"yz-"

Scape

In order to generate a string containing the characters l,L,d and p as a delimiter, you need to use the backslash twice in order to scape it.

Generate a string containing 2 digits followed by the letters lLdp.

iex> RandomStringGenerator.generate("dd\\l\\L\\d\\p")
"39lLdp"

Custom Chars

I order to generate a string based on a given custom pattern ccc a list of possible values need to be passed as an argument.

Generate a string containing 3 custom chars from the list ["+", "-", "/", "*"].

iex> RandomStringGenerator.generate("ccc", ["+", "-", "/", "*"])
"+/*"

If no custom char list is passed the with character c it will be treated as a delimiter as in the example below where it generates a string containing one digit followed by the letter c followed by another digit

iex> RandomStringGenerator.generate("dcd")
"2c1"

Shuffling

In order to generate a string based on a given patter Lldd where those characters are placed in a random order, the shuffle/1 function should be used.

Generate a string containing 2 lower case letters, 2 digits in random order.

iex> RandomStringGenerator.generate("Lldd") |> RandomStringGenerator.shuffle()
"s22E"

Full documentation at https://hexdocs.pm/random_string_generator.