Thue - Esoteric programming language

Thue is an esoteric programming language created in 2004.

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Thue ( TOO-ay) is an esoteric programming language invented by John Colagioia in early 2000. It is a meta-language that can be used to define or recognize Type-0 languages from the Chomsky hierarchy. Because it is able to define languages of such complexity, it is also Turing-complete itself. Read more on Wikipedia...

Thue Wikipedia page

Example from Riju:

a::=~Hello, world!
::=
a

Example from hello-world:

a::=~Hello World
::=
a

Example from Wikipedia:

1_::=1++
0_::=1

01++::=10
11++::=1++0

_0::=_
_1++::=10

::=

_1111111111_