我想删除作为矢量一部分的几个文本字符串的一部分。我要删除的实例是#。## oz。其中#是1到9(含)之间的任何整数。
FoodVector <- c("kraft easy mac cup 2.05oz each", "tuna kit bumble bee 3.05oz each", "lance cheddar cheese wh grain 1.50oz each", "some item 1.0oz")
结果应该是:
[1] kraft easy mac cup each
[2] tuna kit bumble bee each
[3] lance cheddar cheese wh grain each
[4] some item 1.0oz
对于这样的事情,我通常会使用gsub()或str-replace()。但是我不知道通配符语言。例如
gsub("*.**oz", "", FoodVector)
结果:
Error in gsub("*.**", "", FoodVector) :
invalid regular expression '*.**', reason 'Invalid use of repetition operators'
您可以使用gsub删除一位数字的所有实例,然后依次删除.
,两位数字和一个空格。
注意:您的描述是1到9之间的整数,没有空格。此解决方案查找0到9之间的数字,并查找空格,以匹配问题中显示的结果
gsub('\\d{1}\\.\\d{2}oz ', '', FoodVector)
# [1] "kraft easy mac cup each"
# [2] "tuna kit bumble bee each"
# [3] "lance cheddar cheese wh grain each"
# [4] "some item 1.0oz"
要解决Rui在下面的观点,您可以允许空格位于d.ddoz之前或之后
FoodVector <- c(FoodVector, '1.23oz some words', 'more words 3.45oz')
gsub('\\d{1}\\.\\d{2}oz | \\d{1}\\.\\d{2}oz', '', FoodVector)
# [1] "kraft easy mac cup each"
# [2] "tuna kit bumble bee each"
# [3] "lance cheddar cheese wh grain each"
# [4] "some item 1.0oz"
# [5] "some words"
# [6] "more words"