python正則表達式 - 刪除re.sub之前的空白

Question

這裏是我的代碼片斷，這是基本的，我知道！我正在開始冒險進入正則表達式。當我運行下面的代碼時，一切正常，但我想知道如何縮小連字符和字符串替換之間的差距，例如，它指出了一天的持續時間，例如， 「八小時一天」現在寫着「八BOOGIE日」，我想關閉這個空間。請幫忙！

import re 

short_par = 'You must pace your work. What do I mean? I’m glad you asked that. We pace our work according to the eight-hour workday. If you have twelve hours of work in your in-box, for example, you must compress that work into the eight-hour day. If you have one hour of work in your in-box, you must expand that work to fill the eight- hour day. That was a good question. Feel free to ask questions. Ask too many questions, however, and you may be let go.' 

regex = re.compile('[hy]our') 

print(regex.sub('BOOGIE', short_par)) 

Answer 1

您可以使用lookbehind：

(?:(?<=-))?[hy]our 

的回顧後(?<=-)檢查破折號是存在的，但並不匹配。這很重要，因爲我們不希望re.sub取代它。

如果發現短劃線，則(?:(?<=-))?與之後的空格相匹配，以便它被替換。