js正则截取替换特定字符之间的字符串

var html="ssssss @用户名 和话题 #话题标题# 用不同颜色高@假的亮 @用户名2 和sss#此话题不对呀#ss";
	var html1="ssssss @用户名 和话题 #话题标题# 用不同颜色高@假的亮 @用户名2 和sss#此话题不对呀#ss";
	var reg1=/( @[^ ]* )/g;
	var reg2=/( #[^#]*# )/g;
	var reg3=/(#[^#]*#)/g;
	document.write(html);
	document.write("<br/>");
	html=html.replace(reg1,"<span style='color:red'>$1</span>");
	html=html.replace(reg2,"<span style='color:green;'>$1</span>");
	document.write(html);
	document.write("<br/>");
	html1 = html1.replace(reg3,"<span style='color:blue;'>$1</span>");
	document.write(html1);
	document.write("<br/>");

var a = "20141021123212";
	var reg4 = /(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/;
	a = a.replace(reg4,"$1-$2-$3 $4:$5:$6");
	document.write(a);
	document.write("<br/>");

var c ="好啊 {话题标题} 用不同颜色sss{此话题好}ss";
	var reg5=/({[^{]*})/g;
	c = c.replace(reg5,"<span style='color:red'>$1</span>");
	document.write(c);
	document.write("<br/>");