正则表达式是定义搜索模式的字符序列。 Go 语言支持正则表达式。正则表达式用于从大文本（如日志、其他程序生成的输出等）中解析、过滤、验证和提取有意义的信息。
在 Go regexp 中，您可以借助Split()方法将切片拆分为由指定表达式分隔的子字符串。此方法返回这些表达式匹配之间的子字符串片段，计数表示要返回的子字符串数。这个方法是在regexp包下定义的，所以为了访问这个方法，你需要在你的程序中导入regexp包。
句法：
func (re *Regexp) Split(str string, m int) []string在这里，如果m>0 ，那么它最多返回 m 个子串并且最后一个字符串子串不会分裂。如果m == 0 ，那么它将返回 nil。如果m<0 ，则它将返回所有子字符串。
示例 1：
// Go program to illustrate how to split a
// slice separated by the specified expression
package main
import (
"fmt"
"regexp"
)
// Main function
func main() {
// Splitting the given slice which is
// separated by the given expression
// Using Split() method
m1 := regexp.MustCompile(`e`)
fmt.Println(m1.Split("GeeksforGeeks", -1))
fmt.Println(m1.Split("GeeksforGeeks", 1))
fmt.Println(m1.Split("GeeksforGeeks", 0))
fmt.Println(m1.Split("GeeksforGeeks", 3))
fmt.Println(m1.Split("GeeksforGeeks", 2))
fmt.Println()
m2 := regexp.MustCompile(`123`)
fmt.Println(m2.Split("123Gee123ks123Geek123s", -2))
fmt.Println(m2.Split("123Gee123ks123Geek123s", 3))
fmt.Println(m2.Split("123Gee123ks123Geek123s", 0))
fmt.Println(m2.Split("123Gee123ks123Geek123s", -1))
fmt.Println(m2.Split("123Gee123ks123Geek123s", 1))
}
输出：
[G ksforG ks]
[GeeksforGeeks]
[]
[G ksforGeeks]
[G eksforGeeks]
[ Gee ks Geek s]
[ Gee ks123Geek123s]
[]
[ Gee ks Geek s]
[123Gee123ks123Geek123s]
示例 2：
// Go program to illustrate how to split a
// slice separated by the specified expression
package main
import (
"fmt"
"regexp"
)
// Main function
func main() {
// Creating and initializing a string
// Using shorthand declaration
s := "A vv regular vv expression v is vv a sequence v"+
" of vv characters v which define a vv search pattern."
// Splitting the given slice which is
// separated by the given expression
// Using Split() method
m := regexp.MustCompile(`v`)
res1 := m.Split(s, -1)
fmt.Println(res1)
res2 := m.Split(s, 1)
fmt.Println(res2)
res3 := m.Split(s, -0)
fmt.Println(res3)
res4 := m.Split(s, -4)
fmt.Println(res4)
}
输出：
[A regular expression is a sequence of characters which define a search pattern.]
[A vv regular vv expression v is vv a sequence v of vv characters v which define a vv search pattern.]
[]
[A regular expression is a sequence of characters which define a search pattern.]