/**
 * @packageDocumentation
 *
 * Contains utility functions for regular expressions.
 */
/**
 * A strategy to use when merging multiple regex flags into one alternation.
 */
export declare enum RegExpMergeFlagsConflictStrategy {
    /**
     * Keep only the flags present in all regexes.
     */
    Intersect = "Intersect",
    /**
     * Throw an error if the regexes have conflicting flags.
     */
    Throw = "Throw",
    /**
     * Keep only the flags present in any regex.
     */
    Union = "Union"
}
/**
 * Escapes special characters in a string to safely use it within a regular expression.
 *
 * @param str - The string to escape.
 * @returns The escaped string with special characters prefixed with a backslash.
 */
export declare function escapeRegExp(str: string): string;
/**
 * Checks if a string is a valid regular expression.
 *
 * @param str - The string to check.
 * @returns `true` if the string is a valid regular expression, `false` otherwise.
 */
export declare function isValidRegExp(str: string): boolean;
/**
 * A regular expression that always matches.
 */
export declare const ALWAYS_MATCH_REG_EXP: RegExp;
/**
 * A regular expression that never matches.
 */
export declare const NEVER_MATCH_REG_EXP: RegExp;
/**
 * Combine multiple regexes into one alternation, handling flags.
 *
 * @param regExps - The regexes to combine.
 * @param strategy - The strategy to use when merging flags (default: `RegExpMergeFlagsConflictStrategy.Throw`).
 * @returns The combined regex.
 */
export declare function oneOf(regExps: RegExp[], strategy?: RegExpMergeFlagsConflictStrategy): RegExp;