/**
 * Checks if the provided value is a regular expression.
 *
 * A value is considered a regular expression if it is an instance of the RegExp constructor, or if it can be converted to a RegExp.
 *
 * @param {unknown} regExp The value to check.
 * @returns {boolean} True if the value is a regular expression, false otherwise.
 * @example
 * ```typescript
 * console.log(isRegExp(/hello/)); // Output: true
 * console.log(isRegExp("hello")); // Output: true
 * console.log(isRegExp({})); // Output: false
 * ```
 */
export declare function isRegExp(regExp: unknown): regExp is RegExp;