/**
 * Regex patterns for query syntax extraction
 * @module core/query/patterns
 */
/**
 * Pattern definitions for extracting structured data from queries
 */
export declare const PATTERNS: {
    /**
     * Date range: 1920-1930, 1920–1930, 1920..1930
     * Captures: [full match, from year, to year]
     */
    readonly dateRange: RegExp;
    /**
     * Decade: 1920s, 1890s
     * Captures: [full match, decade start year]
     */
    readonly decade: RegExp;
    /**
     * Century: 19th century, 20th century
     * Captures: [full match, century number]
     */
    readonly century: RegExp;
    /**
     * Field:value syntax - field:word or field:"quoted phrase"
     * Captures: [full match, field name, value (may include quotes)]
     */
    readonly fieldValue: RegExp;
    /**
     * Quoted phrase: "Melbourne railway station"
     * Captures: [full match, phrase content without quotes]
     */
    readonly phrase: RegExp;
    /**
     * Exclusion: -advertisement, -classified
     * Captures: [full match, excluded term]
     */
    readonly exclusion: RegExp;
    /**
     * Wildcard: colonial*, rail*
     * Tests for presence of wildcard pattern
     */
    readonly wildcard: RegExp;
};
/**
 * Named era mappings to date ranges
 */
export declare const ERA_MAPPINGS: Record<string, [number, number]>;
/**
 * Valid field names across all sources
 * Used for validation and help messages
 */
export declare const KNOWN_FIELDS: Record<string, string[]>;
/**
 * Get all valid field names across all sources
 */
export declare function getAllValidFields(): string[];
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