julia - 仅按第一次出现的分隔符来分割字符串

Question

我想通过.的第一次出现来拆分字符串。

julia> a = "x1.y1.xyz22"
"x1.y1.xyz22"

julia> split(a,".")
3-element Array{SubString{String},1}:
 "x1"   
 "y1"   
 "xyz22"

如何在Julia中将字符串仅拆分一次才能获得:
“x1”
“y1.xyz22”？

先感谢您，

Answer 1

使用limit关键字。

对于此类问题，您还可以有效地使用内联文档。.只需在控制台中键入?split(或任何其他函数或类型)即可检索该函数，其参数和常用用法示例的详细说明。在这种情况下:

help?> split
search: split splitext splitdir splitpath splitdrive rsplit splice! displaysize @specialize @nospecialize

  split(str::AbstractString, dlm; limit::Integer=0, keepempty::Bool=true)
  split(str::AbstractString; limit::Integer=0, keepempty::Bool=false)

  Split str into an array of substrings on occurrences of the delimiter(s) dlm. dlm can be any of the formats allowed by findnext's first argument (i.e. as a string, regular expression or a function), or as a single character or collection of characters.

  If dlm is omitted, it defaults to isspace.

  The optional keyword arguments are:

    •    limit: the maximum size of the result. limit=0 implies no maximum (default)

    •    keepempty: whether empty fields should be kept in the result. Default is false without a dlm argument, true with a dlm argument.

  See also rsplit.

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> a = "Ma.rch"
  "Ma.rch"

  julia> split(a,".")
  2-element Array{SubString{String},1}:
   "Ma"
   "rch"

  ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

  Splits an HyperRectangle into two along an axis at a given location.