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This is a question from a complete noob. I have the following code:
nb='([- ][0-9]*.[0-9]*E[-+ ][0-9]*)'
nb='([0-9,E.+-]+)'
Is nb overwritten? Or does it do something else?
nbis now bound to the second string,'([0-9,E.+-]+)'. So your first assignment no longer matters. Remember thatnbis simply a name which now points to the second string after previously pointing to the first one, you are not modifying any strings.