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You can search a particular text/string/character within a string by using Contains(). It returns output either true or false. If string 1 found in string 2 then it returns true. If string 1 is not found in string 2 then it returns false.
To check if a given string is empty or not, we can use the built-in len() function in Go language. or we can use the str == "" to check if a string is empty.
1. Trim: This function is used to trim the string all the leading and trailing Unicode code points which are specified in this function. Here, str represent the current string and cutstr represents the elements which you want to trim in the given string. str1 := "!!
How to find the length of the string?: In Golang string, you can find the length of the string using two functions one is len() and another one is RuneCountInString(). The RuneCountInString() function is provided by UTF-8 package, this function returns the total number of rune presents in the string.
Use the function Contains from the strings package.
import (
"strings"
)
strings.Contains("something", "some") // true
To compare, there are more options:
import (
"fmt"
"regexp"
"strings"
)
const (
str = "something"
substr = "some"
)
// 1. Contains
res := strings.Contains(str, substr)
fmt.Println(res) // true
// 2. Index: check the index of the first instance of substr in str, or -1 if substr is not present
i := strings.Index(str, substr)
fmt.Println(i) // 0
// 3. Split by substr and check len of the slice, or length is 1 if substr is not present
ss := strings.Split(str, substr)
fmt.Println(len(ss)) // 2
// 4. Check number of non-overlapping instances of substr in str
c := strings.Count(str, substr)
fmt.Println(c) // 1
// 5. RegExp
matched, _ := regexp.MatchString(substr, str)
fmt.Println(matched) // true
// 6. Compiled RegExp
re = regexp.MustCompile(substr)
res = re.MatchString(str)
fmt.Println(res) // true
Benchmarks:
Contains internally calls Index, so the speed is almost the same (btw Go 1.11.5 showed a bit bigger difference than on Go 1.14.3).
BenchmarkStringsContains-4 100000000 10.5 ns/op 0 B/op 0 allocs/op
BenchmarkStringsIndex-4 117090943 10.1 ns/op 0 B/op 0 allocs/op
BenchmarkStringsSplit-4 6958126 152 ns/op 32 B/op 1 allocs/op
BenchmarkStringsCount-4 42397729 29.1 ns/op 0 B/op 0 allocs/op
BenchmarkStringsRegExp-4 461696 2467 ns/op 1326 B/op 16 allocs/op
BenchmarkStringsRegExpCompiled-4 7109509 168 ns/op 0 B/op 0 allocs/op
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