code: function() {
  			var editor = this.editor;
  			var textView = editor.getTextView();
  			if (textView.getOptions("readonly")) { return false; } //$NON-NLS-0$
  			var model = editor.getModel();
  			forEachSelection(this, false, function(selection, setText) {
  				if (selection.start !== selection.end) { return; }
  			
  				var prevChar = (selection.start === 0) ? "" : model.getText(selection.start - 1, selection.start); //$NON-NLS-0$
  				var nextChar = (selection.start === model.getCharCount()) ? "" : model.getText(selection.start, selection.start + 1); //$NON-NLS-0$
  	
  				if (prevChar === "(" && nextChar === ")" || //$NON-NLS-1$ //$NON-NLS-2$
  					prevChar === "[" && nextChar === "]" || //$NON-NLS-1$ //$NON-NLS-2$
  					prevChar === "{" && nextChar === "}" || //$NON-NLS-1$ //$NON-NLS-2$
  					prevChar === "<" && nextChar === ">" || //$NON-NLS-1$ //$NON-NLS-2$
  					prevChar === '"' && nextChar === '"' || //$NON-NLS-1$ //$NON-NLS-2$
  					prevChar === "'" && nextChar === "'") { //$NON-NLS-1$ //$NON-NLS-2$
  					setText("", selection.start, selection.start + 1); //$NON-NLS-0$
  				}
  			}, true);
  			return false;
  		}
docs: On backspace keypress, checks if there are a pair of brackets or quotation marks to be deleted