Bug 204229 [Automation][Regression]Exception is thrown when preview reportdesign in webviewer
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/RDSave.java
private String getDataSetColumnName ( String expr )
	{
		if( expr == null || expr.trim( ).length( )== 0 || !(expr.matches( "\\QdataSetRow[\"\\E.*\\Q\"]\\E" ) || expr.matches( "\\QdataSetRow.\\E.*" )))
			return null;
		if( expr.matches( "\\QdataSetRow[\"\\E.*\\Q\"]\\E" ))
			return expr.replaceAll( "\\QdataSetRow[\"\\E", "" ).replaceAll( "\\Q\"]\\E", "" );
		else
			return expr.replaceAll( "\\QdataSetRow.\\E", "" );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.document.IRDSave#saveFinish(int)
	 */
	public void saveFinish( int currIndex ) throws DataException
	{
		if ( rowSaveUtil == null )
			this.initSaveRowUtil( );
		exprNameSet = this.getExprNameSet( );
		rowSaveUtil.saveFinish( currIndex );
		this.closeSaveRowUtil( );
		this.saveForIV( );
	}
	/**
	 * @throws DataException
	 */
	private void closeSaveRowUtil( ) throws DataException
	{
		try
		{
			this.rowExprsOs.close( );