SQL Query Help - find Field Name within Text - Iterative loop

Hi

I need some help to write an SQL query please.  I have a problem in my application where using calculated fields works fine when working with database fields or constants, and is also fine when a calculated field is used within another calculated field.  It break when there are nested calculated fields beyond 1 level deep.  I wish to construct a SQL query to identify to me any records which this affects.

Here is a sample of some rows where the problem exists:

TableID	FieldName	Seq	DataType	IsCalculated	Formula	FieldFormat	FieldLabel	Alias
Calculated	HrlyCost	8	decimal	1	50			
Calculated	VarOnWag	14	decimal	1	(ProcLabCost + PackLabCost) * 999	->>,>>9.99	Variable on Wages	Calculated_VarOnWag
Calculated	FixOnBas	18	decimal	1	BaseCost * 999	->>,>>9.99	Fixed on Base	Calculated_FixOnBas
Calculated	FullCost	19	decimal	1	WageCost + VarOnWag + BaseCost + FixOnBas	->>,>>9.99	Fully Costed	Calculated_FullCost
Calculated	PackLabCost	12	decimal	1	(HrlyCost * Part_UD.Number07) / NULLIF((Part_UD.Number06 * 999), 0)	->>,>>9.99	Packing Labour Cost	Calculated_PackLabCost
Calculated	BaseCost	17	decimal	1	CostPart.StdMaterialCost * 150 / NULLIF(100, 0)	->>,>>9.99	Base Cost incl Waste	Calculated_BaseCost
Calculated	ProcLabCost	11	decimal	1	Part1_UD.Number05 * Part.NetWeight	->>,>>9.99	Process Labour Cost	Calculated_ProcLabCost
Calculated	WageCost	13	decimal	1	ProcLabCost + PackLabCost	->>,>>9.99	Wages Cost	Calculated_WageCost
Calculated	PPK	22	decimal	1	FullCost / NULLIF(Part.NetWeight, 0)	->>,>>9.99	Cost PPK	Calculated_PPK

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I'll also try to demonstrate the nested fields here:


The field PPK as you can see above has 4 levels.  

Is there anyway to query for and show the number of levels based on the data provided above?

Many Thanks
Mark.