accesslog.js
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	/*
	Language: Apache Access Log
	Author: Oleg Efimov <efimovov@gmail.com>
	Description: Apache/Nginx Access Logs
	Website: https://httpd.apache.org/docs/2.4/logs.html#accesslog
	Category: web, logs
	Audit: 2020
	*/

	/** @type LanguageFn */
	function accesslog(hljs) {
	const regex = hljs.regex;
	// https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
	const HTTP_VERBS = [
	"GET",
	"POST",
	"HEAD",
	"PUT",
	"DELETE",
	"CONNECT",
	"OPTIONS",
	"PATCH",
	"TRACE"
	];
	return {
	name: 'Apache Access Log',
	contains: [
	// IP
	{
	className: 'number',
	begin: /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(:\d{1,5})?\b/,
	relevance: 5
	},
	// Other numbers
	{
	className: 'number',
	begin: /\b\d+\b/,
	relevance: 0
	},
	// Requests
	{
	className: 'string',
	begin: regex.concat(/"/, regex.either(...HTTP_VERBS)),
	end: /"/,
	keywords: HTTP_VERBS,
	illegal: /\n/,
	relevance: 5,
	contains: [
	{
	begin: /HTTP\/[12]\.\d'/,
	relevance: 5
	}
	]
	},
	// Dates
	{
	className: 'string',
	// dates must have a certain length, this prevents matching
	// simple array accesses a[123] and [] and other common patterns
	// found in other languages
	begin: /\[\d[^\]\n]{8,}\]/,
	illegal: /\n/,
	relevance: 1
	},
	{
	className: 'string',
	begin: /\[/,
	end: /\]/,
	illegal: /\n/,
	relevance: 0
	},
	// User agent / relevance boost
	{
	className: 'string',
	begin: /"Mozilla\/\d\.\d \(/,
	end: /"/,
	illegal: /\n/,
	relevance: 3
	},
	// Strings
	{
	className: 'string',
	begin: /"/,
	end: /"/,
	illegal: /\n/,
	relevance: 0
	}
	]
	};
	}

	module.exports = accesslog;