/**
 * Generic value matcher implementation, shared by url, query and headers matchers.
 */
import type { ContainsMatcher, RegexMatcher, ValueMatcher, ValueMatcherInit } from '../value-matcher';
export declare function isValueMatcher(v: unknown): v is ContainsMatcher | RegexMatcher;
export declare function matchValue(expected: ValueMatcher, actual: unknown): boolean;
/**
 * Converts a bare `RegExp` to a serializable `{ $regex }` matcher.
 * Passes through null and undefined.
 */
export declare function serializeRegexp<T>(value: T): T extends RegExp ? RegexMatcher : T;
/**
 * Serializes bare regular expressions in a matcher record.
 * Passes through null and undefined.
 */
export declare function serializeRegexpInRecord(record: Record<string, ValueMatcherInit | null> | null | undefined): {
    [k: string]: string | number | ContainsMatcher | RegexMatcher | null;
} | null | undefined;
/**
 * Builds a RegExp from a string.
 * Accepts either a plain pattern ('foo.*') or a '/pattern/flags' form (consistent with URL's regexp matching).
 * The '/pattern/flags' form is only used when the trailing part contains valid regex flags,
 * so a plain pattern that merely starts with '/' is not misinterpreted.
 */
export declare function regexpFromString(s: string): RegExp;
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