import type { ExprValue, StringValue } from '../types.js';
/**
 * Function that returns true if a string contains a regexp pattern,
 * false otherwise.
 * @param string The string match against.
 * @param pattern The regular expression pattern to match.
 * @param options Regular expression options:
 *  'c': case-sensitive matching
 *  'i': case-insensitive matching
 *  'l': match literals instead of regular expression tokens
 *  'm', 'n', 'p': newline sensitive matching
 *  'g': global replace, only available for regexp_replace
 *  's': non-newline sensitive matching
 */
export declare function regexp_matches(string: ExprValue, pattern: StringValue, options?: StringValue): import("../index.js").FunctionNode;
/**
 * Function that returns true if search_string is found within string.
 * @param string The string to match against.
 * @param search_string The substring to search for.
 */
export declare function contains(string: ExprValue, search_string: StringValue): import("../index.js").FunctionNode;
/**
 * Function that returns true if string begins with search_string.
 * @param string The string to match against.
 * @param search_string The substring to search for.
 */
export declare function prefix(string: ExprValue, search_string: StringValue): import("../index.js").FunctionNode;
/**
 * Function that returns true if string ends with search_string.
 * @param string The string to match against.
 * @param search_string The substring to search for.
 */
export declare function suffix(string: ExprValue, search_string: StringValue): import("../index.js").FunctionNode;
/**
 * Function that converts string to lower case.
 * @param string The string to convert.
 */
export declare function lower(string: ExprValue): import("../index.js").FunctionNode;
/**
 * Function that converts string to upper case.
 * @param string The string to convert.
 */
export declare function upper(string: ExprValue): import("../index.js").FunctionNode;
/**
 * Function that returns the number of characters in string.
 * @param value The string to measure.
 */
export declare function length(value: ExprValue): import("../index.js").FunctionNode;
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