Go 标准包 strings 学习（8）ReplaceAll,Split,SplitAfter

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本次学习

ReplaceAll,Split,SplitAfter

https://pkg.go.dev/strings@go1.20.4#ReplaceAll

func ReplaceAll

ReplaceAll returns a copy of the string s with all non-overlapping instances of old replaced by new. If old is empty, it matches at the beginning of the string and after each UTF-8 sequence, yielding up to k+1 replacements for a k-rune string.

ReplaceAll返回字符串s的副本，其中所有不重叠的old实例替换为new。如果old为空，它匹配字符串的开头和每个UTF-8序列之后，为k-rune字符串产生最多k+1个替换。

案例

输出

moo moo moo

理解

没啥好说的，作用和方法名一样用new把s里面的old全替换掉

func Split

Split slices s into all substrings separated by sep and returns a slice of the substrings between those separators.

If s does not contain sep and sep is not empty, Split returns a slice of length 1 whose only element is s.

If sep is empty, Split splits after each UTF-8 sequence. If both s and sep are empty, Split returns an empty slice.

It is equivalent to SplitN with a count of -1.

To split around the first instance of a separator, see Cut.

将切片拆分为所有以sep分隔的子字符串，并返回分隔符之间的子字符串切片。

如果s不包含sep且sep不为空，Split返回一个长度为1的切片，其中唯一的元素是s。

如果sep为空，Split在每个UTF-8序列之后进行分割。如果s和sep都为空，Split返回一个空片。

它相当于计数为-1的SplitN。

要围绕分隔符的第一个实例进行拆分，请参见切割。

案例

输出

["a" "b" "c"]

["" "man " "plan " "canal panama"]

[" " "x" "y" "z" " "]

[""]

理解

将s用sep拆分成切片

func SplitAfter

SplitAfter slices s into all substrings after each instance of sep and returns a slice of those substrings.

If s does not contain sep and sep is not empty, SplitAfter returns a slice of length 1 whose only element is s.

If sep is empty, SplitAfter splits after each UTF-8 sequence. If both s and sep are empty, SplitAfter returns an empty slice.

It is equivalent to SplitAfterN with a count of -1.

SplitAfter在sep的每个实例之后将s切片为所有子字符串，并返回这些子字符串的一个切片。

如果s不包含sep且sep不为空，则SplitAfter返回一个长度为1的切片，其中唯一的元素是s。

如果sep为空，SplitAfter在每个UTF-8序列之后进行分割。如果s和sep都为空，则SplitAfter返回一个空切片。

它相当于计数为-1的SplitAfterN。

案例1

输出1

["a," "b," "c"]

案例2

输出2

["a," "b," "c," "," ""]