Count from a string

i am using this formula
{USR_CR_RISK_CHANGE;1.DETAIL}[instrrev({USR_CR_RISK_CHANGE;1.DETAIL},'OLD: LowRisk')-1 to length({USR_CR_RISK_CHANGE;1.DETAIL})];
this retrieves
OLD: LowRisk NEW: MediumRisk
which is what i want
i want to then get a count of how many risk changes there were from low to medium
the original string looks like this
| LastOper OLD: SQLUSER NEW: LUCI01| LastModify OLD: May 11 2009 10:03AM NEW: May 11 2009 12:17PM| RiskClass OLD: LowRisk NEW: MediumRisk
if there is a way to get a count from the original string that would work also
thanks

if instr({@OLD LOW RISK},'LowRisk') > 0
and
instr ({@OLD LOW RISK},'MediumRisk')>0 then
1 else 0
This seems to work

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SCH2 100 +290 - 300 = 90 on time for 07Jun2009 date

Count from a string

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