R:gsub保留字符串中字符之间的空格而不删除

我有一个字符串，它们之间有数字字符

TestString = "white tiger roars.12.03.001-fast horse runs13.15.01.001-cat is useless 11.01.09.001-dog barks22.07.01.001"

我不想让它看起来像

"white tiger roars-fast horse runs-cat is useless-dog barks"

到目前为止，我无法保留字里行间的空隙

gsub("[^a-z-]", "", TestString) 
#"whitetigerroars-fasthorseruns-catisuseless-dogbarks"

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只需添加一个空格？[^a-z-]或gsub\\d*[.]*，TestStrings这太简单了。感谢这将导致无用的狗吠在最后，这是不同于预期的结果。

gsub("\\s?(\\d+|\\.)","","white tiger roars.12.03.001-fast horse runs13.15.01.001-cat is useless 11.01.09.001-dog barks22.07.01.001")
[1] "white tiger roars-fast horse runs-cat is useless-dog barks"