Golang is an open source statically typed programming language developed by Google. Golang has many advantages in syntax and performance, so it is very popular among developers. In Golang, find and replace are frequently used operations, so this article will introduce how to perform find and replace operations in Golang.
1. Search
In Golang, the strings package provides multiple string manipulation functions, one of which is the Contains function. This function can be used to determine whether a string contains another string.
The sample code is as follows:
package main import ( "fmt" "strings" ) func main() { str := "apple banana" substr := "banana" fmt.Println(strings.Contains(str, substr)) // true }
The Index function can return the position of the first occurrence of a string in another string. If not present, -1 is returned.
The sample code is as follows:
package main import ( "fmt" "strings" ) func main() { str := "apple banana" substr := "banana" fmt.Println(strings.Index(str, substr)) // 6 }
The Count function can return the number of times a string appears in another string.
The sample code is as follows:
package main import ( "fmt" "strings" ) func main() { str := "apple banana apple apple" substr := "apple" fmt.Println(strings.Count(str, substr)) // 3 }
2. Replacement
The Replace function is used to replace all specified characters in the string character.
The sample code is as follows:
package main import ( "fmt" "strings" ) func main() { str := "apple banana" oldSubstring := "apple" newSubstring := "orange" newStr := strings.Replace(str, oldSubstring, newSubstring, -1) fmt.Println(newStr) // orange banana }
The ReplaceAll function is also used to replace all specified characters in a string.
The sample code is as follows:
package main import ( "fmt" "strings" ) func main() { str := "apple banana" oldSubstring := "apple" newSubstring := "orange" newStr := strings.ReplaceAll(str, oldSubstring, newSubstring) fmt.Println(newStr) // orange banana }
The ReplaceN function is used to replace the first n specified characters in a string.
The sample code is as follows:
package main import ( "fmt" "strings" ) func main() { str := "apple banana apple" oldSubstring := "apple" newSubstring := "orange" newStr := strings.ReplaceN(str, oldSubstring, newSubstring, 1) fmt.Println(newStr) // orange banana apple }
Summary
This article introduces common string functions for search and replace operations in Golang. These functions can help us process strings more conveniently and improve the efficiency and readability of the code.
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