First example. We have a string that contains "this is a test." The word "test" is found in the string. When we invoke Contains and search for "test," we receive true.
Argument 1 The first argument to Contains is a string. It is the string we are searching inside.
Argument 2 The second argument is the value we are searching for within the first argument.
package main
import (
"fmt"
"strings"
)
func main() {
value1 := "test"
value2 := "python"
source := "this is a test"// This succeeds.// ... The substring is contained in the source string.
if strings.Contains(source, value1) {
fmt.Println(1)
}
// Contains returns false here.
if !strings.Contains(source, value2) {
fmt.Println(2)
}
}1
2
ContainsAny. This method is different from Contains—it searches for characters. If any of the values in the second string argument to ContainsAny are found, it returns true.
Argument 1 The first argument to ContainsAny is the string we are searching for values within.
Argument 2 This is a set of values—just one has to be found for the method to return true.
package main
import (
"fmt"
"strings"
)
func main() {
source := "12345"// See if 1, 3 or 5 are in the string.
if strings.ContainsAny(source, "135") {
fmt.Println("A")
}
// See if any of these 3 chars are in the string.
if strings.ContainsAny(source, "543") {
fmt.Println("B")
}
// The string does not contain a question mark.
if !strings.ContainsAny(source, "?") {
fmt.Println("C")
}
}A
B
C
Contains is clearer than Index() when we just need to test existence. We can test against true and false, not the magical value -1 that Index() returns to mean "not found."
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Jul 21, 2023 (edit).
