>> 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]')
>
> I think
>
> _{0,3}[A-Z](\-?[A-Z0-9])+
>
> will do what you are looking for.
That, doesn't allow single hyphen, which his requirement allowed as long
as it (the hypehn) is not as the first or last character.
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