/**
 * String Utilities
 * Common string manipulation and validation functions
 */
/**
 * Check if a string contains any of the provided substrings
 */
export declare function containsAny(str: string, substrings: readonly string[]): boolean;
/**
 * Check if string matches any of the provided patterns (case-insensitive regex)
 */
export declare function matchesAny(str: string, patterns: readonly string[]): boolean;
/**
 * Check if string is one of the provided values (case-insensitive)
 */
export declare function isOneOfIgnoreCase(str: string, values: readonly string[]): boolean;
/**
 * Get file extension from URL or filename
 */
export declare function getFileExtension(url: string): string | null;
/**
 * Check if URL/filename has any of the provided extensions
 */
export declare function hasAnyExtension(url: string, extensions: readonly string[]): boolean;
/**
 * Media file extensions
 */
export declare const MEDIA_EXTENSIONS: {
    readonly IMAGE: readonly ["jpg", "jpeg", "png", "gif", "webp", "svg", "ico", "bmp", "tiff"];
    readonly VIDEO: readonly ["mp4", "webm", "avi", "mov", "wmv", "flv", "mkv", "3gp"];
    readonly AUDIO: readonly ["mp3", "wav", "ogg", "aac", "flac", "m4a", "wma"];
};
/**
 * Get all media extensions as a flat array
 */
export declare function getAllMediaExtensions(): string[];
/**
 * Media MIME type prefixes
 */
export declare const MEDIA_MIME_PREFIXES: readonly ["image/", "video/", "audio/"];
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