删除字符串中小词的出现 [英] Remove occurences of small words within a string
问题描述
我正在尝试从字符串中删除特定单词.我无法用简单的全局字符串替换"the"来清空字符串，因为"the"可能是字符串中单词的一部分.
I'm trying to remove a specific word from a string. I can't do a simple global string replace for "the" to empty string as "the" could be part of a word in the string.
word: "the"
string: "the_ad_an_feta_cfr_era_the_iop_the"
output: "ad_an_feta_cfr_era_iop"
"the"一词可能在字符串的开头，中间或结尾多次，因此我必须考虑分隔符和字符串的开头/结尾.
The word "the" could be at the beginning, several times in the middle or at the end of the string so I have to take into account the separator and beginning/end of string.
我可以用一个正则表达式处理所有这些问题，还是应该求助于循环，但是如何在sed中指定多个模式?
Could I handle all this with one regex or should I resort to looping, but how do I specify the multiple patterns in sed?
sed 's/the//g' <<< "the_ad_feta_cfr_era_the_iop_the"
然后，如果我想从同一字符串中删除几个单词，该怎么办?不仅删除"the"，还删除"is"，"an".所有这些都可以在正则表达式中合而为一吗?
Then how would I do it if I had several words I wanted to remove from the same string? Instead of only "the" also remove "is", "an". Can all this be one in regex without looping?
word: "the", "an", "is"
input: "the_ad_an_feta_cfr_era_the_iop_the"
output: "ad_feta_cfr_era_iop"
推荐答案
看看这个 sed :
$ string='the_ad_an_feta_cfr_era_the_iop_the'
$ sed -E -e ':a' -e 's/(^|_)(the|an|is|feta)(_|$)/\1/g;ta' -e 's/_$//' <<< "$string"
ad_cfr_era_iop
请注意，Unix变体之间， sed 的行为有所不同.您的 sed 似乎在标签(或多个 -e 选项)之后需要换行符.进一步阅读:
Note that the behavior of sed differs between Unix variants. Your sed seems to require newlines after labels (or multiple -e options). Further reading:
没有标签的版本与 @Cyrus的答案基本相同，但支持带空格的项目":
Version without labels which is essentially the same as @Cyrus' answer but supports "items" with spaces:
$ string='the_ad_an_feta_cfr_era_the cfr_the_iop_the'
$ sed -E -e 's/_/__/g;s/(^|_)(the|an|is|feta)(_|$)//g;s/_+/_/g;s/^_//;s/_$//' <<< "$string"
ad_cfr_era_the cfr_iop
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