const escape = string => {
    if (typeof string !== 'string') {
        throw new TypeError('Expected a string');
    }

    // Escape characters with special meaning either inside or outside character sets.
    // Use a simple backslash escape when it’s always valid, and a \unnnn escape when the simpler form would be disallowed by Unicode patterns’ stricter grammar.
    return string
        .replace(/[|\\{}()[\]^$+*?.]/g, '\\$&')
        .replace(/-/g, '\\x2d');
}

if (!RegExp.escape) {
    RegExp.escape = escape;
}

module.exports.escape = escape;