import { Predicate, PredicateOptions } from './predicate';
export declare class StringPredicate extends Predicate<string> {
    /**
    @hidden
    */
    constructor(options?: PredicateOptions);
    /**
    Test a string to have a specific length.

    @param length - The length of the string.
    */
    length(length: number): this;
    /**
    Test a string to have a minimum length.

    @param length - The minimum length of the string.
    */
    minLength(length: number): this;
    /**
    Test a string to have a maximum length.

    @param length - The maximum length of the string.
    */
    maxLength(length: number): this;
    /**
    Test a string against a regular expression.

    @param regex - The regular expression to match the value with.
    */
    matches(regex: RegExp): this;
    /**
    Test a string to start with a specific value.

    @param searchString - The value that should be the start of the string.
    */
    startsWith(searchString: string): this;
    /**
    Test a string to end with a specific value.

    @param searchString - The value that should be the end of the string.
    */
    endsWith(searchString: string): this;
    /**
    Test a string to include a specific value.

    @param searchString - The value that should be included in the string.
    */
    includes(searchString: string): this;
    /**
    Test if the string is an element of the provided list.

    @param list - List of possible values.
    */
    oneOf(list: readonly string[]): this;
    /**
    Test a string to be empty.
    */
    readonly empty: this;
    /**
    Test a string to be not empty.
    */
    readonly nonEmpty: this;
    /**
    Test a string to be equal to a specified string.

    @param expected - Expected value to match.
    */
    equals(expected: string): this;
    /**
    Test a string to be alphanumeric.
    */
    readonly alphanumeric: this;
    /**
    Test a string to be alphabetical.
    */
    readonly alphabetical: this;
    /**
    Test a string to be numeric.
    */
    readonly numeric: this;
    /**
    Test a string to be a valid date.
    */
    readonly date: this;
    /**
    Test a non-empty string to be lowercase. Matching both alphabetical & numbers.
    */
    readonly lowercase: this;
    /**
    Test a non-empty string to be uppercase. Matching both alphabetical & numbers.
    */
    readonly uppercase: this;
    /**
    Test a string to be a valid URL.
    */
    readonly url: this;
}