Case-insensitive filtering for arrays

[NetOpWibby]

Is your feature request related to a problem? Please describe.
I am trying to run partial matches of a string with strings in an array. Currently, nothing I have tried works.

Describe the solution you'd like
I'd like an example on the offical site that shows how I might achieve this functionality.

Describe alternatives you've considered

// 1
r.expr([`(?i)${suppliedString}`]).contains(row("dataStuff"));
// 2
row("dataStuff").contains(`(?i)${suppliedString}`);
// 3
row("dataStuff").contains(`(?i)${suppliedString}`).default(false);
// 4
row("dataStuff").contains(`(?i)${suppliedString}`).default(true);

I've also tried this:

r.expr([suppliedString]).contains(row("dataStuff"));

It works only when suppliedString is the exact case and spelling.

Additional context
Case-insensitive filtering is easy to do with strings like in the example shown on this page:

// Will return william, William, WILLIAM, wiLLiam etc.
r.table("users").filter(function(user) {
    return user("name").match("(?i)^william$");
}).run(conn, function(err, result) {
    if (err) throw err;
    console.log(result);
});

[yaneony]

Can you please provide data structure you are using?

matches of a string with strings in an array

You will probably need to use .map function as well in that case.