import { OptionSpec } from './spec';
/**
 * Searches with JavaScript's own RegExp instead of the POSIX engine.
 *
 * NOT a less option — less has no such switch, because less has no such
 * choice: it links whatever regcomp its libc ships and that is the end
 * of it. This exists so the two engines can be compared from one
 * binary, and because a JS RegExp is the faster of the two on patterns
 * it can express.
 *
 * Turning it on changes the LANGUAGE, not just the implementation:
 * `a|ab` matches "a" rather than the longer "ab", `[[:alpha:]]` stops
 * being a character class, `\d` becomes a digit again rather than the
 * letter, and a pattern like `(a+)+b` can hang the engine outright.
 */
export declare const useJsRegexp: OptionSpec;