You can simulate how the function works by installing and loading the package and setting the security content.
Here the variable $$var is assigned to the value "5+7"; note that the value is a string.
When MSPToExpression evaluates, the parsed value of $$var is returned.
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If a variable has no value, an MSPException is thrown.
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Like ToExpression, MSPToExpression can take a format type for interpretation.
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If the input value cannot be interpreted, an MSPException is thrown.
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If the input value does not pass the security test, an MSPException is thrown.
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Input can also be given in MathML.
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