Question

我使用police_officer <- str_extract_all(txtparts, "ID:.*\n")从文本文件中提取参与911呼叫的警察的所有姓名。例如：
2237 DISTURBANCE Report taken Call Taker: Telephone Operators Sharon L Moran Location/Address: [BRO 6949] 61 WILSON ST ID: Patrolman Darvin Anderson Disp-22:43:39 Arvd-22:48:57 Clrd-23:49:45 ID: Patrolman Stephen T Pina Disp-22:43:48 Clrd-22:46:10 ID: Sergeant Michael V Damiano Disp-22:46:33 Arvd-22:47:14 Clrd-22:55:22

在某些部分匹配多个ID:时，我得到："c(\" Patrolman Darvin Anderson\\n\", \" Patrolman Stephen T Pina\\n\", \" Sergeant Michael V Damiano\\n\")"。以下是我迄今为止尝试清理数据的方法：
police_officer <- str_replace_all(police_officer,"c\\(.","") police_officer <- str_replace_all(police_officer,"\\)","") police_officer <- str_replace_all(police_officer,"ID:","") police_officer <- str_replace_all(police_officer,"\\n\","") # I can't get rid of\\n\.

这就是我最终的结果 " Patrolman Darvin Anderson\\n\", \" Patrolman Stephen T Pina\\n\", \" Sergeant Michael V Damiano\\n\""

我需要帮助清理\\n\。

Answer 1

您可以将以下正则表达式与str_match_all：

一起使用

\bID:\s*(\w+(?:\h+\w+)*)

请参阅regex demo

> txt <- "Call Taker:    Telephone Operators Sharon L Moran\n  Location/Address:    [BRO 6949] 61 WILSON ST\n                ID:    Patrolman Darvin Anderson\n                       Disp-22:43:39                 Arvd-22:48:57  Clrd-23:49:45\n                ID:    Patrolman Stephen T Pina\n                       Disp-22:43:48                                Clrd-22:46:10\n                ID:    Sergeant Michael V Damiano\n                       Disp-22:46:33                 Arvd-22:47:14  Clrd-22:55:22"
> str_match_all(txt, "\\bID:\\s*(\\w+(?:\\h+\\w+)*)")
[[1]]
     [,1]                                [,2]                        
[1,] "ID:    Patrolman Darvin Anderson"  "Patrolman Darvin Anderson" 
[2,] "ID:    Patrolman Stephen T Pina"   "Patrolman Stephen T Pina"  
[3,] "ID:    Sergeant Michael V Damiano" "Sergeant Michael V Damiano"

正则表达式将ID:作为整个单词匹配，然后匹配零个或多个空格（使用\s*），然后捕获字母数字字符序列（可选地用水平空格分隔）。 str_match_all有助于提取捕获的部分，因此，您无法将str_extract_all与此正则表达式一起使用。

<强>更新

> time <- str_trim(str_extract(txt, " [[:digit:]]{4}"))
> Call_taker <- str_replace_all(str_extract(txt, "Call Taker:.*\n"),"Call Taker:","" ) %>% str_replace_all("\n","")
> address <- str_extract(txt, "Location/Address:.*\n")
> Police_officer <- str_match_all(txt, "\\bID:\\s*(\\w+(?:\\h+\\w+)*)")
> BPD_log <- cbind(time,Call_taker,address,list(Police_officer[[1]][,2]))
> BPD_log <- as.data.frame(BPD_log)
> colnames(BPD_log) <- c("time", "Call_taker", "address", "Police_officer")
> BPD_log
  time                             Call_taker                                        address
1 6949     Telephone Operators Sharon L Moran Location/Address:    [BRO 6949] 61 WILSON ST\n
                                                                   Police_officer
1 Patrolman Darvin Anderson, Patrolman Stephen T Pina, Sergeant Michael V Damiano
>

清洁＆＃39; stringr str_replace_all＆＃39;多次匹配时自动连接

1 个答案: