Bug 205782 Excel can't process big data which type is Decimal.
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelUtil.java
exp = exp.replaceAll( reg4, "Z" );
		Pattern p = Pattern.compile( aggregateRegExp );
		Matcher m = p.matcher( exp );
		boolean agg = m.matches( );
		p = Pattern.compile( columnRegExp );
		m = p.matcher( exp );
		return agg || m.matches( );
	}
	public static String expression( String val, String target, String[] res,
			boolean casesenstive )
	{
		boolean flag = casesenstive ? target.equals( val ) : target
				.equalsIgnoreCase( val );
		return flag ? res[1] : res[0];
	}
	public static int covertDimensionType( DimensionType value, int parent )
	{
		if ( DimensionType.UNITS_PERCENTAGE.equals( value.getUnits( ) ) )
		{
			return (int) (value.getMeasure( ) / 100 * parent);
		}
		else
		{
			return (int) (value.convertTo( DimensionType.UNITS_PT ));
		}
	}
	
	
}