Here's a way to find all dates matching your pattern
re.findall(r'dds(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)sd{4}', text)
But after WilhelmTell's comment on your question, I'm also wondering whether this it what you were really asking for...
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…