在列中使用逗号读取CSV文件

我有一个包含6列的csv文件,其中一列的文本用逗号分隔,例如BOLT,RD HD SQ SHORT NECK,METRIC.

当我在R中读取此文件时,此列中存在溢出,随后数据移动到新行.

下面我贴了几行

014003051906,ETN5080,0450,螺栓套件上轴,5速,1.000,F 014003051906,ETN5967,0460,传感器传感器FH后挡板,1.000,F 014003051906,ETN64267,0470,倾斜装置传感器,1.000,F

014003065376,03M7184,0020,BOLT - M 8.0 X 1.250 X 20.0 - 8.8-Zinc,4.000,G 014003065376,03M7386,0090,BOLT,RD HD SQ短颈,公制,18.000,G 014003065376,14M7296,0090,NUT,METRIC ,HEX FLANGE,14.000,G

最后两行是问题所在."NUT,METRIC,HEX FLANGE"应该归入一个变量.

怎么解决这个问题？

data <- readLines(con = textConnection("014003051906,ETN5080 ,0450,BOLT KIT UPPER SHAFT WITH 5 SPEED,1.000,F
014003051906,ETN5967 ,0460,SENSOR SENSOR FH BACKSHAFT SPEED,1.000,F
014003051906,ETN64267 ,0470,TILT UNIT SENSOR,1.000,F

014003065376,03M7184 ,0020,BOLT - M 8.0 X 1.250 X 20.0 - 8.8-Zinc,4.000,G
014003065376,03M7386 ,0090,BOLT, RD HD SQ SHORT NECK, METRIC,18.000,G
014003065376,14M7296 ,0090,NUT, METRIC, HEX FLANGE,14.000,G"))

pattern <- "^([^,]*),([^,]*),([^,]*),(.*),([^,]*),([^,]*)$"

library(stringr)
str_match(data, pattern)[, - 1]
#      [,1]           [,2]        [,3]   [,4]                                     [,5]     [,6]
# [1,] "014003051906" "ETN5080 "  "0450" "BOLT KIT UPPER SHAFT WITH 5 SPEED"      "1.000"  "F" 
# [2,] "014003051906" "ETN5967 "  "0460" "SENSOR SENSOR FH BACKSHAFT SPEED"       "1.000"  "F" 
# [3,] "014003051906" "ETN64267 " "0470" "TILT UNIT SENSOR"                       "1.000"  "F" 
# [4,] NA             NA          NA     NA                                       NA       NA  
# [5,] "014003065376" "03M7184 "  "0020" "BOLT - M 8.0 X 1.250 X 20.0 - 8.8-Zinc" "4.000"  "G" 
# [6,] "014003065376" "03M7386 "  "0090" "BOLT, RD HD SQ SHORT NECK, METRIC"      "18.000" "G" 
# [7,] "014003065376" "14M7296 "  "0090" "NUT, METRIC, HEX FLANGE"                "14.000" "G" 

编辑:
初学者的正则表达式解释,用简单的词语请原谅不准确:

初始^和终端$的意思是启动和字符串的结尾.

Parens用于分组(str_match()将提取的组).

.表示任何字符,.*表示任何数量的字符.

[^,] 表示任何不是逗号的字符.

放在一起时,这意味着:start of string- - substring without a comma(comma重复3次) - - substring possibly containing commas- comma- substring without a comma- comma- substring without a comma,end of string只有带括号的组被提取.