Regulära uttryck och array i JavaScript

function nl2br() {
	var newrows = /\n/g;
	var bold = /\[b\](.+?)\[\/b]/gi;

	find = new Array(bold, newrows);
	replace = new Array('<b>$1</b>', '<br>');

	var messageValue = document.getElementById('preview').value.replace(find, replace);
	document.getElementById('test').innerHTML = messageValue;
}

function nl2br() {
	var regexp_newrows = /\n/g;
	var regexp_bold = /\[b\](.+?)\[\/b]/gi;

	var real_newrows = '<br>';
	var real_bold = '<b>$1</b>';

	var messageValue = document.getElementById('add-smiley').value.replace(regexp_newrows, real_newrows)
																  .replace(regexp_bold, real_bold);

	document.getElementById('test').innerHTML = messageValue;
}