Hello,
I'm trying to write a regular expression to filter strings that meet the
following criteria:
1. Starts with 0-3 underscores;
2. Followed by one letter;
3. Then followed by 0 or more letters or digits or hyphens('-'),
4. Ends with one letter or digit; and
5. There should not be more than one continuous hyphens.
This is what I have so far. I think it meets all the criteria except for the
last one. Haven't figured out the answer yet.
re.compile(r'_{0,3}[A-Z][A-Z0-9\-]*[A-Z0-9]')
Thank you.
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