找到了：
# auto convert @username to clickable links
def mentions(value):
ms = re.findall('(@[a-zA-Z0-9\_]+\.?)\s?', value)
if (len(ms) > 0):
for m in ms:
m_id = re.findall('@([a-zA-Z0-9\_]+\.?)', m)
if (len(m_id) > 0):
if (m_id[0].endswith('.') != True):
value = value.replace('@' + m_id[0], '@<a href="/member/' + m_id[0] + '">' + m_id[0] + '</a>')
return value
else:
return value
register.filter(mentions)

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现在是匹配的英文和数字吧？想让它同时匹配中文、英文、数字的话，该怎么改呢？