/**
 * Escape Unicode Characters
 * @param text
 * @param regexp
 * @returns
 */
export declare function escapeUnicodeCode(text: string, regexp?: RegExp): string;
/**
 * Converts a string of letters in ranges.
 *
 * `abcde` => `a-e`
 *
 * @param letters - sorted letters
 */
export declare function toRange(letters: string, minLength?: number): string;
export declare function removeAccents(text: string): string;
export declare function removeLooseAccents(text: string): string;
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