decode uigs中的查询词

# coding=gbk
import urllib
import re

def decodeQuery(query):
	lowStr = query.lower()
		
	if lowStr.find("%u")!=-1:
		t = re.compile(r"%u([0-9a-f]{2})([0-9a-f]{2})",re.IGNORECASE)
		matchList = t.findall(lowStr)
		for match in matchList:
			hex = match[0]+match[1]
			chr = hex.decode("hex")
			try:	
				dechr = chr.decode("utf-16be").encode("gbk")
				lowStr = lowStr.replace("%u"+hex,dechr)
			except:
				lowStr = lowStr.replace("%u"+hex,"?")
	else:
		lowStr = lowStr.replace("\\x","%")

	try:
		deQuery = urllib.unquote(lowStr)
	except:
		deQuery = lowStr 
	
	return deQuery