/**
 * Regex pattern validator with ReDoS protection
 */
import type { ValidationResult } from '../types.js';
/**
 * Validates regex patterns for ReDoS vulnerabilities
 */
export declare class RegexValidator {
    private readonly maxLength;
    constructor(maxLength?: number);
    /**
     * Validate regex pattern for safety
     */
    validate(pattern: string): ValidationResult;
    /**
     * Detect nested quantifiers like (a+)+ which cause exponential backtracking
     */
    private hasNestedQuantifiers;
    /**
     * Detect alternation groups with quantifiers which can cause backtracking
     */
    private hasAmbiguousAlternation;
}
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