directus

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/**
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 * Result for keys with a function (e.g. `year(date_created)`):
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 * - Group 1: Function (`year`)
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 * - Group 3: Field (`date_created`)
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 *
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 * If group 3 is undefined, it is a key without a function.
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 */
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const FILTER_KEY_REGEX = /^([^()]+)(\(([^)]+)\))?/;
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/**
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 * Parses a filter key, returning its field name and function name (if defined) separately.
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 */
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export function parseFilterKey(key: string) {
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	const match = key.match(FILTER_KEY_REGEX);
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	const fieldNameWithFunction = match?.[3]?.trim();
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	const fieldName = fieldNameWithFunction || key.trim();
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	let functionName;
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	if (fieldNameWithFunction) {
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		functionName = match?.[1]?.trim();
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		return { fieldName, functionName };
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	}
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	return { fieldName, functionName };
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}
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