wildling

Elixir library and CLI for pattern-based string generation. Zero Hex dependencies (Elixir/Erlang stdlib only — hand-rolled JSON parser). Requires Elixir 1.14+ / OTP 25+.

Docs: Website · Sandbox · Syntax · Source

Registry: Hex

Example

http://${'dev,stage,prod'}\-${'api,web'}#{0-2}.example.${'com,net,org'}/@.html

(The \- is a literal hyphen; bare - would mean “one letter or digit”. @ is one lowercase letter.)

That builds URL-shaped candidates: scheme http://, then environment × service × optional digits × TLD, then a one-letter path page. Three environments, two services, zero–two digits ('', 0–9, 00–99), three TLDs, and a–z → 51948 strings — the kind of list you generate for fuzzing links or probing staging hosts, not type out.

A few of them:

http://dev-api.example.com/a.html / http://stage-web.example.com/z.html
http://dev-api0.example.net/a.html / http://prod-web9.example.org/m.html
http://dev-api00.example.com/a.html / http://prod-web99.example.org/z.html

Named dictionaries (%{'hosts'}) work the same way when the word lists live in files.

Try it in the sandbox, or see pattern syntax for length ranges, dictionaries, and escapes.

Install

From this repository:

cd elixir
./build.sh
./bin/wildling "Year 19##"

Git (mix.exs):

{:wildling, git: "https://github.com/dotmonk/wildling.git", tag: "v2.0.0", path: "elixir"}

Registry: {:wildling, "~> 2.0"} on Hex

w = Wildling.create(["Year 19##"])
value = Wildling.next(w)
Stream.unfold(value, fn
  false -> nil
  v -> {v, Wildling.next(w)}
end)
|> Enum.each(&IO.puts/1)

CLI

./bin/wildling "Year 19##"
./bin/wildling --dictionary planets:../dictionaries/planets.txt "%{'planets'}"
./bin/wildling --template ./config.json

Help text and --check output follow docs/cli.md / docs/help.txt.

Build

./build.sh   # Docker (gcc:14-bookworm + apt elixir): cache .elixir, copy help.txt, elixirc

Project tests live in ../tests/ and are run with ../test.sh.