swirly | A marble diagram generator | Animation library

I'm trying to find a RegEx pattern that lets me match on all parentheses (and their content) as long as these parentheses are between { and }.

Examples:

• {foo (i,j) bar} should match on (i,j)
• {(i,j) foo (k,l) bar (m,n,o)} should match on (i,j), (k,l), and (m,n,o).
• foo (i,j) bar should not match on anything because the string is not between swirly brackets.
• {foo (i,j) bar} (k,l) should match on (i,j) but not (k,l) because the latter is outside of the swirly brackets.

The closest I came was with this pattern: (?<=\{)[^\(].*\(.*?\).*(?=\}). This pattern matched on the first, second, and fourth example, but matched on all of the content between the swirly brackets instead of only the parentheses and their content.

Here's the code I have been using... (and it's been working great!)

I'm getting green swirly lines underneath the await keyword.

When I hover the mouse over the green swirly lines, it says 'await' applied to 'Query', which is not a 'Future'.

I'm not sure to which statement the await keyword needs to be applied.

Without applying the await/async and Future to the method the calling method doesn't wait for this method to get completed and continues with executing the rest of the code, therefore returning a null value.

Please find below the code which is in question: