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关于python正则re.search匹配的困惑

re.search(r'(%[0-9a-fA-F]{2})', r'自定:%E8%87%AA%E5%AE%9A%E5')
# '%E8'
re.search(r'(%[0-9a-fA-F]{2})*', r'自定:%E8%87%AA%E5%AE%9A%E5')
# ''
re.search(r'((%[0-9a-fA-F]{2})*)', r'自定:%E8%87%AA%E5%AE%9A%E5')
# ''
re.search(r'(?<=:)((%[0-9a-fA-F]{2})*)', r'自定:%E8%87%AA%E5%AE%9A%E5')
# '%E8%87%AA%E5%AE%9A%E5'

请问为什么第一行可以匹配到一个hex,二三行却匹配到一个空字符?
为什么第四行设定了前方是一个:后,又匹配到了全部的hex字符?


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