您最多选择25个主题
主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
24 行
506 B
24 行
506 B
ipv4_regex <-
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"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
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#' Convert a vector of IPv4 addresses to in-addr.arpa format
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#'
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#' @md
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#' @param ipv4 vector of ipv4 addresses
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#' @export
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to_inaddr_arpa <- function(ipv4) {
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ifelse(
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test = grepl(ipv4_regex, ipv4),
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yes = paste0(
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c(
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rev(unlist(strsplit(ipv4, ".", 4), use.names = FALSE)),
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"in-addr.arpa."
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),
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sep = "",
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collapse = "."
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),
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no = ipv4
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)
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}
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