我迫切需要一个从 R 中的集体推文中提取主题标签的解决方案。
例如：
[[1]]
[1] "RddzAlejandra: RT @NiallOfficial: What a day for @johnJoeNevin ! Sooo proud t have been there to see him at #London2012 and here in mgar #MullingarShuffle"
[[2]]
[1] "BPOInsight: RT @atos: Atos completes delivery of key IT systems for London 2012 Olympic Games http://t.co/Modkyo2R #london2012"
[[3]]
[1] "BloombergWest: The #Olympics sets a ratings record for #NBC, with 219M viewers tuning in. http://t.co/scGzIXBp #london2012 #tech"
我如何解析它以提取所有推文中的主题标签单词列表。
以前的解决方案仅在第一条推文中显示主题标签，并在代码中显示以下错误消息：
> string <-"MonicaSarkar: RT @saultracey: Sun kissed #olmpicrings at #towerbridge #london2012 @ Tower Bridge http://t.co/wgIutHUl"
>
> [[2]]
Error: unexpected '[[' in "[["
> [1] "ccrews467: RT @BBCNews: England manager Roy Hodgson calls #London2012 a \"wake-up call\": footballers and fans should emulate spirit of #Olympics http://t.co/wLD2VA1K"
Error: unexpected '[' in "["
> hashtag.regex <- perl("(?<=^|\\s)#\\S+")
> hashtags <- str_extract_all(string, hashtag.regex)
> print(hashtags)
[[1]]
[1] "#olmpicrings" "#towerbridge" "#london2012"
Using regmatches and gregexpr这为您提供了每条推文的主题标签列表，假设主题标签的格式为 # 后跟任意数量的字母或数字（我对 twitter 不太熟悉）：
foo <- c("RddzAlejandra: RT @NiallOfficial: What a day for @johnJoeNevin ! Sooo proud t have been there to see him at #London2012 and here in mgar #MullingarShuffle","BPOInsight: RT @atos: Atos completes delivery of key IT systems for London 2012 Olympic Games http://t.co/Modkyo2R #london2012","BloombergWest: The #Olympics sets a ratings record for #NBC, with 219M viewers tuning in. http://t.co/scGzIXBp #london2012 #tech")
regmatches(foo,gregexpr("#(\\d|\\w)+",foo))
Returns:
[[1]]
[1] "#London2012" "#MullingarShuffle"
[[2]]
[1] "#london2012"
[[3]]
[1] "#Olympics" "#NBC" "#london2012" "#tech"
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