如何仅识别由“连接”组成的单词-&引用；在R？

让我们假设，我在R中有以下文本：

x = "The effects in the medium-term of an appreciation of the exchange rate are still to be carefully assessed in our projections. However, we can observe in the short-term that the our pogramme of purchasing asset-backed securities had a positive impact on overall economic activity"

我如何才能只获得以下信息：

# medium-term
# short-term
# asset-backed 

基本上，我只需要提取那些由“-”链接的单词

有人能帮我吗

谢谢

这是否有效：

library(stringr)
str_extract_all(x, '\\b[a-z]+-[a-z]+\\b')[[1]]
[1] "medium-term"  "short-term"   "asset-backed"

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在base R中，您可以使用：

regmatches(x, gregexpr('\\w+-\\w+', x))[[1]]
#[1] "medium-term"  "short-term"   "asset-backed"

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非常感谢你们两位。如果SO允许，我将标记正确答案。我通常会给得分最低的受访者打分。再次感谢！