/** Normalize a field/header/query name for set + fragment matching: lowercase, strip separators. */
export declare const norm: (name: string) => string;
/** Global clone for whole-string .replace(); avoids sharing lastIndex with the .test() callers. */
export declare const g: (re: RegExp) => RegExp;
export declare const emailRe: RegExp;
export declare const ssnRe: RegExp;
export declare const phoneRe: RegExp;
export declare const e164Re: RegExp;
export declare const ipv4Re: RegExp;
export declare const ipv6Re: RegExp;
export declare const macRe: RegExp;
export declare const uuidRe: RegExp;
export declare const digitRunRe: RegExp;
export declare const ibanRe: RegExp;
export declare const cryptoRe: RegExp;
export declare const jwtRe: RegExp;
export declare const bearerRe: RegExp;
export declare const secretTokenRe: RegExp;
export declare const pemBlockRe: RegExp;
export declare const pemDetectRe: RegExp;
/** ISO 7064 MOD-97-10 (the IBAN check), re-implemented (never copied from a copyleft lib).
 *  Move the first 4 chars to the end, map A–Z→10..35, reduce mod 97; a valid IBAN yields 1.
 *  Returns -1 on a stray char. */
export declare function mod97(iban: string): number;
/** An IBAN only if it matches the format AND passes mod-97 — the checksum lets us redact
 *  real IBANs without destroying lookalike business identifiers. */
export declare function isIbanValue(s: string): boolean;
/** Luhn (mod-10) check over a pure-digit string of length ≥13. */
export declare function luhn(digits: string): boolean;
/** A pure-digit string that looks like a card number: a Luhn-valid 13–19 run, or a
 *  suspiciously long (>40) run. Shared by the string scrubber and the JSON walker so a
 *  numeric PAN is caught before it can break the body's JSON. */
export declare function looksLikePan(digits: string): boolean;