如何在R中使用gsub从字符串中删除非数字字符?

我使用R中的gsub函数删除数字中不需要的字符.因此，我应该从字符串中删除不是数字，.和-的每个字符.我的问题是正则表达式不能删除某些非数字字符，例如d，+和<.

I use the gsub function in R to remove unwanted characters in numbers. So I should remove from the strings every character that is not a number, ., and -. My problem is that the regular expression is not removing some non-numeric characters like d, +, and <.

下面是我的正则表达式，gsub执行及其输出.如何更改正则表达式以实现所需的输出?

Below are my regular expression, the gsub execution, and its output. How can I change the regular expression in order to achieve the desired output?

当前输出:

gsub(pattern = '[^(-?(\\d*\\.)?\\d+)]', replacement = '', x = c('1.2<', '>4.5', '3+.2', '-1d0', '2aadddab2','1.3h'))
[1] "1.2<"  ">4.5"  "3+.2"  "-1d0"  "2ddd2" "1.3"

所需的输出:

[1] "1.2"  "4.5"  "3.2"  "-10"  "22" "1.3"

谢谢.