/**
 * A utility class providing helper methods for manipulating and working with DOM structures.
 */
export declare class DomHelper {
    /**
     * Creates a regular expression pattern to match an attribute with a specific value.
     * @param {RegExp} value The regular expression pattern to match the attribute value.
     * @returns {RegExp} A regular expression pattern to match attributes in the format `key="value"` where the value matches the provided pattern.
     */
    static createAttributeValuePattern(value: RegExp): RegExp;
    /**
     * Wraps HTML content in a single container element if necessary.
     * @param {string} html The HTML string to process.
     * @returns {DocumentFragment} A DocumentFragment containing either the original content if it has exactly one root element,
     * or the content wrapped in a div if it has multiple or no root elements.
     */
    static wrapHtmlInSingleDiv(html: string): DocumentFragment;
}