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This function returns the starting point of the second argument within the first.

Forms of use:

DI ivar = %INDEX(cvar,cvar),

DI ivar = %INDEX(cvar,field),

DI ivar = %INDEX(cvar,literal),

DI ivar = %INDEX(field,cvar),

DI ivar = %INDEX(field,field),

DI ivar = %INDEX(field,literal),

If the second argument is not found within the first, the result is returned as U (undefined).