Hi,

whats the correct way to match a char-list against another charlist, but as a variable? Like so:

input = 'Hello World! {{ }} {% %}'
pattern = '{{'
...
case input do
    ^pattern ++ remaining ->
        ...
end

but this isn’t working.

Context:
I currently try to build a parser for twig-like templates to reuse code I already have, but mostly for learning purposes as I’ve never came in touch with elixir or erlang before. Erlang already comes with leex and yecc, but they (or I) struggle with context-switching (programs embedded in text-content). So I try to build a very light-weight parser to tell the content-context and program-context apart and then use leex/yecc to parse the program-islands.
Twig-templates might look like this:
Hi, my name is {{ person.name }} and I am {{ person.years }} year{% person.years != 1 ? ‘s’ : ‘’ %} old.
{% include ‘@common/details.twig’ with person %}

Since the opening-tags are configurable, I have a special case, where I’m stuck at and I dont manage to find help online.

At the most fundamental level, I have a function that should tell me, whats the first occurence of a list of char-sequences (char-list).

Like template |> MyScanner.get_next_position_of({'{{', '{%', '{#'}) to find the nearst opening-tag in my template to toggle the twig-context.

Now inside the get_next_position_of-function, I thought I could simply use recursion to step through all chars in the template and use pattern-matching to check, if the upcoming sequence of characters matches one of the patterns, I gave as the argument.