Extracts nearest HTML tag range from <code>content</code>, starting at
<code>pos</code> position
@param {String} content
@param {Number} pos
@param {Boolean} isBackward
@returns {Range}
function(content, pos, isBackward) {
			var len = content.length, i;
			var range = require('range');
			
			// max extraction length. I don't think there may be tags larger 
			// than 2000 characters length
			var maxLen = Math.min(2000, len);
			
			/** @type Range */
			var r = null;
			
			var match = function(pos) {
				var m;
				if (content.charAt(pos) == '<' && (m = content.substr(pos, maxLen).match(startTag)))
					return range.create(pos, m[0]);
			};
			
			// lookup backward, in case we are inside tag already
			for (i = pos; i >= 0; i--) {
				if (r = match(i)) break;
			}
			
			if (r && (r.inside(pos) || isBackward))
				return r;
			
			if (!r && isBackward)
				return null;
			
			// search forward
			for (i = pos; i < len; i++) {
				if (r = match(i))
					return r;
			}
		}