Determine if a value range expression is a simple range expression.
vreIsSingleValue is a utility function that returns 'TRUE' if the
specified value range expression is a simple range expression of the
form "value1<=v<value2", where the logical comparisons can be < or <= only
and the values must be numbers.
vreIsSimpleNumericRange(vre)
vre |
The value range expression to examine. |
'TRUE' if vre is a simple range expression, 'FALSE' otherwise.
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