前言
本篇文章很短，就是記錄一個偶然遇到的問題
問題復現
是這樣的，在用xpath解析某網站的時候，由於網站數據格式是普通的html，而非json字符串，所以只能解析DOM對象，有的能用正則表達式的我都儘量用正則表達式了，沒法用正則的我都用beautifulsoup庫或者pyquery了，但是沒法，通用型還是沒法跟xpath比，而且我已經寫好一版，在有限的時間改的話就很煩了
不多說，先看問題
首先部分的網站源碼如下：
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</article>
然後我的xpath語法就是解析不了，我用以下代碼測試：
就很奇怪了，經過我的測試，發現是因爲有emoji表情符引起的，
我把那些emoji符號刪除了就可以正常解析了：
就很騷了。
你知道這個問題我花了1個小時排查嗎，我真的是一點一點的把問題摳出來的，就感覺我在逆向js代碼一樣一段一段摳
解決問題
一開始我想的是，用beautifulsoup找出那段有emoji的符號部分的節點刪除就行，問題是解決了：
但是我發現並不是很通用，因爲，有可能emoji不會一定存在於我篩選出來的那個class爲_6qdm上，也可能出現在其他地方。
那麼就還是得用正則匹配了：
re.compile(u'[\U00010000-\U0010ffff]')
既然能匹配到，那就用sub替換即可：
f = open('profile.html',encoding='utf-8')
cont = f.read()
f.close()
try:
pattern = re.compile(u'[\U00010000-\U0010ffff]')
except re.error:
pattern = re.compile(u'[\uD800-\uDBFF][\uDC00-\uDFFF]')
print(pattern.findall(cont))
cont = pattern.sub('',cont)
# soup = BeautifulSoup(cont, 'html.parser')
# remove_obj = soup.select('span[class="_6qdm"]')
# if remove_obj:
# [rem.extract() for rem in remove_obj]
# html_xpath = etree.HTML(str(soup))
html_xpath = etree.HTML(cont)
print(html_xpath.xpath('//text()'))
執行：
驗證下，我換了一個html結構：
果然能匹配到，ok，問題解決