Hello all, First of all I wasn't really sure where to post this so please let me know if I'm in the wrong forum for such a question. I understand the basics of git, but I'm still very new. I have used git locally and on github. I was wondering if this was possible: I want to set up my main git repository in my Dropbox, then have the same repository on my local mac machine and a remote HPC. So when I can edit them in my dropbox and always have them pulling from there. The problem is I …

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1. Exactly what are regex? 2. Do we write them ourselves or are they prdefined expressions? 3. If we can write regex ourselves, how do we write them? 4. How do they check for invadalities? For example the email regex: [-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+\.[a-zA-Z]{2,4} how does this expression check for valid email addresses? I have tried to look for simple explanations on the web but have found nothing confusing stuff. Thankyou!

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Is the following possible using Python? 1. Given a directory with 500 emails in it. These are all bounced emails. 2. Have script open 1st email 3. Python extracts the failed email address (from body of email, not header or addressing) 4. Script appends found email address to separate file of bad addresses 5. Script does 2 thru 4 to the rest of the emails, untl they've all been harvested Result is a single file with all the bad addresses.

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The End.