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******
cnum()
******
Purpose
=======
cnum(expr)
Converts expr to a number (integer).
.. note::
If the expression does not contain a numerical value, the following
rule applies: the best match as the number is returned. For example
"1x234" will return the number 1 and "Test123" will return 0. Zero is
always returned if the there is no number at the start of the string.
This also is the case for empyt strings.
Example
=======
.. code-block:: none
cnum(3+2);
produces
.. code-block:: none
5
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