我有一个关于从 R 列表中删除非字母数字字符的问题。我有一个列表，将各种奇怪的字符，空白等，并希望删除它们。我通常可以使用 r 中的 tm 包删除我想要的内容。我摆弄了一下，但无处可去，所以认为回到列表可能是开始的地方。
该列表：
list("n n", "nn ", "n ", " ", "n ",
"n n ", "n ", "Home", "n", "Expertise",
"Question & Research Design", "n", "Survey Development & Validation",
"n", "Data Processing", "n", "Statistical Analysis", "n",
"Publications & Grants", "n", "Evaluation", "n", "n",
"Consulting Areas", "Business", "n", "Education", "K-12",
"n", "Â ", " Â Â Â Â", " | ")
预期输出
[1] "" "" ""
[4] "" "" ""
[7] "" "Home" ""
[10] "Expertise" "Question Research Design" ""
[13] "Survey Development Validation" "" "Data Processing"
[16] "" "Statistical Analysis" ""
[19] "Publications Grants" "" "Evaluation"
[22] "" "" "Consulting Areas"
[25] "Business" "" "Education"
[28] "K12" "" ""
[31] "" ""
强烈建议您简单地使用
gsub("[^a-zA-Z0-9]","",x)
其中 x 是列表的名称。
您可能在列表末尾包含外来字符，因为您也希望删除这些字符 - 好吧，上面的命令可以实现这一点。简而言之，命令中的方括号定义了符号集合，^ 符号表示"not"，因此不在指定 62 个字符集中的所有内容（小写 a 到 z，大写 A 到 Z，数字 0 到 9）都将替换为空字符串 "（即销毁）。
这是输出...
[1] "" "" ""
[4] "" "" ""
[7] "" "Home" ""
[10] "Expertise" "QuestionResearchDesign" ""
[13] "SurveyDevelopmentValidation" "" "DataProcessing"
[16] "" "StatisticalAnalysis" ""
[19] "PublicationsGrants" "" "Evaluation"
[22] "" "" "ConsultingAreas"
[25] "Business" "" "Education"
[28] "K12" "" ""
[31] "" ""
我不确定这是否摆脱了您要删除的所有内容......但是?regexp描述了您可以使用的各种穿插的广泛类。 对于您所描述的内容，我认为您想要：
gsub('[[:space:]|[:punct:]]+', '', yourlist)
这给了：
[1] "" "" "" ""
[5] "" "" "" "Home"
[9] "" "Expertise" "QuestionResearchDesign" ""
[13] "SurveyDevelopmentValidation" "" "DataProcessing" ""
[17] "StatisticalAnalysis" "" "PublicationsGrants" ""
[21] "Evaluation" "" "" "ConsultingAreas"
[25] "Business" "" "Education" "K12"
[29] "" "Â" "ÂÂÂÂ" ""