R 中的字符串 - 在字符串和数字之间插入 desired/arbitrary 数字
Strings in R - Insert a desired/arbitrary digit between a string and digit
我有一个如下所示的字符向量：
questions <- c("question1" "question10" "question11" "question12"
"question13" "question14" "question15" "question16" "question17",
"question18" "question2" "question3" "question4" "question5" "question6"
"question7" "question8" "question9")
我想在 "question" 和单个数字之间插入一个 0，以便字符向量看起来像：
questions <- c("question01" "question10" "question11" "question12"
"question13" "question14" "question15" "question16" "question17",
"question18" "question02" "question03" "question04" "question05"
"question06" "question07" "question08" "question09")
请注意，与两位数相关联的字符串 "question"，即 "question10" 或 "question18 不受影响。
我是模式匹配的新手。我尝试了以下代码：
gsub(pattern = "(\D*)(\d{1})", replacement = "0\1", x = mydf6$Question, perl = TRUE)
但是，它没有给出预期的结果。
如有任何帮助，我们将不胜感激。
尝试
gsub("(?<=[a-z])(\d)$", "0\1", mydf6$Question, perl = T)
这个替换为零，但前提是字符串以单个数字结尾，前面是小写字母。
我有一个如下所示的字符向量：
questions <- c("question1" "question10" "question11" "question12"
"question13" "question14" "question15" "question16" "question17",
"question18" "question2" "question3" "question4" "question5" "question6"
"question7" "question8" "question9")
我想在 "question" 和单个数字之间插入一个 0，以便字符向量看起来像：
questions <- c("question01" "question10" "question11" "question12"
"question13" "question14" "question15" "question16" "question17",
"question18" "question02" "question03" "question04" "question05"
"question06" "question07" "question08" "question09")
请注意，与两位数相关联的字符串 "question"，即 "question10" 或 "question18 不受影响。
我是模式匹配的新手。我尝试了以下代码：
gsub(pattern = "(\D*)(\d{1})", replacement = "0\1", x = mydf6$Question, perl = TRUE)
但是，它没有给出预期的结果。
如有任何帮助，我们将不胜感激。
尝试
gsub("(?<=[a-z])(\d)$", "0\1", mydf6$Question, perl = T)
这个替换为零，但前提是字符串以单个数字结尾，前面是小写字母。