R将单词与数字分开 [英] R separate words from numbers in string

问题描述

我需要清理一些包含单词和数字或仅包含数字的数据字符串。

I need to clean up some data strings that have words and numbers or just numbers.

下面是一个玩具样本

library(tidyverse)

c("555","Word 123", "two words 123", "three words here 123") %>%  
sub("(\\w+) (\\d*)",  "\\1|\\2", .)

结果是这样的：

[1] "555"                  "Word|123"             "two|words 123"        "three|words here 123"

，但我想将'|'放在最后一组数字之前如下所示

but I want to place the '|' before the last set of numbers like shown below

[1] "|555"                  "Word|123"             "two words|123"        "three words here|123"

推荐答案

我们可以使用 sub 以匹配零个或多个空格（ \\s * ），然后是我们捕获为一组的数字（ （\\d）），并在替换中使用 | ，后跟反向引用（ \\捕获的组中的1 ）

We can use sub to match zero or more spaces (\\s*) followed by a digit we capture as a group ((\\d)) and in the replacement use the | followed by the backreference (\\1) of the captured group

sub("\\s*(\\d)", "|\\1", v1)
#[1] "|555"                 "Word|123"            
#[3] "two words|123"        "three words here|123"

数据

data

v1 <- c("555","Word 123", "two words 123", "three words here 123")

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