我有下面的文字，需要在特定单词之前和之后提取特定单词
示例：
sometext <- "about us, close, products & services, focus, close, research & development, topics, carbon fiber reinforced thermoplastic, separators for lithium ion batteries, close, for investors, close, jobs & careers, close, \nselect language\n\n, home > corporate social responsibility > \nsocial report\n > quality assurance\n, \nensuring provision of safe products, \nthe teijin group resin & plastic processing business unit is globally expanding its engineering plastics centered on polycarbonate resin, where we hold a major share in growing asian markets. these products are widely used in applications such as automotive components, office automation equipment and optical discs (blu-ray, dvd). customers include automotive manufacturers, electronic equipment manufacturers and related mold companies. customer data is organized into a database as groundwork to actively promote efforts to enhance customer satisfaction., \nin accordance with iso 9001 (8-4, 8-2), the regular implementation of"
library(stringi)
stri_extract_all_fixed(sometext , c('engineering plastics', 'iso 9001','office automation'), case_insensitive=TRUE, overlap=TRUE)
以下的实际输出
[[1]]
[1] "engineering plastics"
[[2]]
[1] "iso 9001"
[[3]]
[1] "office automation"
必需的输出：
[1] globally expanding its engineering plastics centered on polycarbonate resin
[2] accordance with iso 9001 (8-4, 8-2), the regular implementation of
基本上需要在我提到的具体单词之前和之后提取文本
答案 0 :(得分：0)
这是一个开头的想法：
sometext <- "about us, close, products & services, focus, close, research & development, topics, carbon fiber reinforced thermoplastic, separators for lithium ion batteries, close, for investors, close, jobs & careers, close, \nselect language\n\n, home > corporate social responsibility > \nsocial report\n > quality assurance\n, \nensuring provision of safe products, \nthe teijin group resin & plastic processing business unit is globally expanding its engineering plastics centered on polycarbonate resin, where we hold a major share in growing asian markets. these products are widely used in applications such as automotive components, office automation equipment and optical discs (blu-ray, dvd). customers include automotive manufacturers, electronic equipment manufacturers and related mold companies. customer data is organized into a database as groundwork to actively promote efforts to enhance customer satisfaction., \nin accordance with iso 9001 (8-4, 8-2), the regular implementation of"
library(stringi)
words <- c('engineering plastics', 'iso 9001','office automation')
pattern <- stri_paste("([^ ]+ ){0,10}", words, "([^ ]+ ){0,10}")
stri_extract_all_regex(sometext , pattern, case_insensitive=TRUE, overlap=TRUE)
<强>说明： 我在你想要的单词之前和之后添加了简单的正则表达式：
"([^ ]+ ){0,10}"
表示：
这非常简单和天真（例如，它将所有＆＃39;＆amp;＆＃39;或＆＃39;＆gt;＆＃39;视为单词）但是有效。