/* jshint esversion: 6 */
"use strict";

const assert = require('assert');

const lisdigit = function(c) {
    return /^\d$/.test(c.charAt(0));

const lisxdigit = function(c) {
    return /^[0-9a-fA-F]$/.test(c.charAt(0));
};

const lisspace = function(c) {
    return /^\s$/.test(c.charAt(0));
};

const lislalpha = function(c) {
    return /^[_a-zA-z]$/.test(c.charAt(0));
};

const lislanum = function(c) {
    return /^[_a-zA-z0-9]$/.test(c.charAt(0));
};

module.exports.lisdigit  = lisdigit;
module.exports.lislalpha = lislalpha;
module.exports.lislanum  = lislanum;
module.exports.lisspace  = lisspace;
module.exports.lisxdigit = lisxdigit;