/**
 * Regex Cache Utility
 * Provides caching for compiled regex patterns to improve performance
 * Backward compatible optimization
 */
/**
 * Thread-safe regex pattern cache
 */
export declare class RegexCache {
    private static cache;
    /**
     * Get or create a compiled regex pattern
     * @param pattern - The regex pattern string
     * @param flags - Optional regex flags
     * @returns Compiled RegExp instance
     */
    static getPattern(pattern: string, flags?: string): RegExp;
    /**
     * Clear the entire cache
     */
    static clear(): void;
    /**
     * Get cache statistics
     * @returns Cache size and statistics
     */
    static getStats(): {
        size: number;
        keys: string[];
    };
    /**
     * Check if a pattern is cached
     * @param pattern - The regex pattern string
     * @param flags - Optional regex flags
     * @returns True if pattern is cached
     */
    static hasPattern(pattern: string, flags?: string): boolean;
    /**
     * Pre-cache common patterns for better performance
     */
    static precacheCommonPatterns(): void;
}
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