/**
 * camelCase -> snake_case
 */ // 2Xs, 3Xs, 4S
export declare const SIZE_SUB_GROUP = '[0-9][X,S,M,L][s,m,l]{0,1}(?=([A-Z]|[0-9][A-Z]|$))';
export declare function convertCamelToSnake(str: string): string;