如何使用正则表达式用空格替换字符之间的短划线

发布时间：2020-12-14 06:22:15 所属栏目：百科来源：网络整理

导读：我想用正则表达式替换出现在带空格的字母之间的短划线.例如,用ab cd替换ab-cd 以下匹配字符 – 字符序列,但也替换字符[即ab-cd导致d,而不是ab cd,因为我希望] new_term = re.sub(r"[A-z]-[A-z]"," ",original_term) 我如何适应以上只能取代 – 部分？您需

我想用正则表达式替换出现在带空格的字母之间的短划线.例如,用ab cd替换ab-cd

以下匹配字符 – 字符序列,但也替换字符[即ab-cd导致d,而不是ab cd,因为我希望]

new_term = re.sub(r"[A-z]-[A-z]"," ",original_term)

我如何适应以上只能取代 – 部分？

您需要捕获 – 组之前和之后的字符并将其用于替换,即：

import re
subject = "ab-cd"
subject = re.sub(r"([a-z])-([a-z])",r"1 2",subject,re.IGNORECASE)
print subject
#ab cd

DEMO

http://ideone.com/LAYQWT

REGEX EXPLANATION

([A-z])-([A-z])

Match the regex below and capture its match into backreference number 1 ?([A-z])?
   Match a single character in the range between “A” and “z” ?[A-z]?
Match the character “-” literally ?-?
Match the regex below and capture its match into backreference number 2 ?([A-z])?
   Match a single character in the range between “A” and “z” ?[A-z]?

1 2

Insert the text that was last matched by capturing group number 1 ?1?
Insert the character “ ” literally ? ?
Insert the text that was last matched by capturing group number 2 ?2?

（编辑：李大同）

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