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SymFind(OldStr,FindStr,StartIndex,IsInv)
SymFind(OldStr,FindStr,StartIndex)
SymFind(OldStr,FindStr)

OldStrַ洢ҪҵԴַ
FindStrַ洢Ҫҵıַ
StartIndexҿʼʼ(1ʼ).Ϊ,ʱĬΪ1ʱĬΪַ
IsInv0ʾңңĬΪ

ûҵ0

ӣ
i=SymFind("125325","25",4)//سõ½
i =
[ 5.00000000000000 ]