import { Context } from "koa";
import { SimpleInput } from "../controls/simple-input.js";
import { FormDataValue } from "../form-types.js";
import { FieldParseResult, FormField } from "./field.js";
import { FormControlContext } from "../controls/form-control.js";
export declare class RegExpField<Required extends boolean> extends FormField<Required, string, SimpleInput, string> {
    regexp: RegExp;
    error_message: string;
    default_value: string;
    constructor(required: Required, regexp: RegExp, error_message: string, default_value?: string);
    predicate: import("@sealcode/ts-predicates").Predicate<string>;
    isValueValid(_: Context, value: unknown): Promise<{
        valid: boolean;
        message: string;
    }>;
    parse(_: Context, value: FormDataValue): Promise<FieldParseResult<string>>;
    getEmptyValue(): string;
    getControl(): SimpleInput;
    getSealiousCreateValue(fctx: FormControlContext): Promise<string>;
    sealiousValueToForm(ctx: Context, sealious_value: string | null): Promise<FormDataValue>;
}