Congrats, very promising! Little improvement needed

[j2l]

This is a great idea! I understand how regex sucks in this huge case :)

Here's what I get when converting https://www.shadertoy.com/view/MlBXW1 :

Shader error in 'ShaderToy/test': undeclared identifier 'iChannel0' at line 43 (on glcore)

I proposed a pull request