Golang |分割由指定表达式分开的切片
原文:https://www . geesforgeks . org/golang-spliting-a-slice-由指定表达式分隔/
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。正则表达式用于解析、过滤、验证和从大文本中提取有意义的信息，如日志、其他程序生成的输出等。 在 Go regexp 中，您可以借助 Split() 方法将一个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量。这个方法是在 regexp 包下定义的，所以要访问这个方法，需要在程序中导入 regexp 包。
语法:
func (re *Regexp) Split(str string, m int) []string
这里如果 m > 0 ，那么最多返回 m 个子串，最后一个字符串子串不会拆分。如果 m == 0 ，则返回零。如果 m < 0 ，那么它将返回所有子串。
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]
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.]
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