Regular expressions not working correctly on Linux

[Loek-hol]

MEGPy does not work correctly on my system, running Linux. I have tested it using multiple different versions of Python. This seems to be due to a problem with the regular expressions, which do not read the input file correctly. The resulting error is shown below.

[gsnoep]

This seems to have been resolved in #12. The regular expression was not the culprit, but the use of a variable name that clashed with a function name (both named number).