diff --git a/text/gstr/gstr_z_example_test.go b/text/gstr/gstr_z_example_test.go
new file mode 100644
index 000000000..0bbfc8415
--- /dev/null
+++ b/text/gstr/gstr_z_example_test.go
@@ -0,0 +1,1538 @@
+package gstr
+
+import (
+	"fmt"
+
+	"github.com/gogf/gf/text/gstr"
+)
+
+func ExampleAddSlashes() {
+	var str string
+	str = `'aa'"bb"cc\r\n\d\t`
+	rsStr := gstr.AddSlashes(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// \'aa\'\"bb\"cc\\r\\n\\d\\t
+}
+
+func ExampleCaseCamel() {
+	var str string
+	str = `goframe_is very nice.to-use`
+	rsStr := gstr.CaseCamel(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// GoframeIsVeryNiceToUse
+}
+
+func ExampleCaseCamelLower() {
+	var str string
+	str = `goframe_is very nice.to-use`
+	rsStr := gstr.CaseCamelLower(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframeIsVeryNiceToUse
+}
+
+func ExampleCaseDelimited() {
+	var str string
+	var del uint8
+	str = `goframe_is_very-nice.to-use`
+	del = 35
+	rsStr := gstr.CaseDelimited(str, del)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe#is#very#nice#to#use
+}
+
+func ExampleCaseDelimitedScreaming() {
+	var str string
+	var del uint8
+	var screaming bool
+	str = `goframe_is Very Nice.to-use`
+	del = 35
+	screaming = true
+	rsStr := gstr.CaseDelimitedScreaming(str, del, screaming)
+	fmt.Println(rsStr)
+
+	// Output:
+	// GOFRAME#IS#VERY#NICE#TO#USE
+}
+
+func ExampleCaseKebab() {
+	var str string
+	str = `goframe_is Very Nice.to-use`
+	rsStr := gstr.CaseKebab(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe-is-very-nice-to-use
+}
+
+func ExampleCaseKebabScreaming() {
+	var str string
+	str = `goframe_is Very Nice.to-use`
+	rsStr := gstr.CaseKebabScreaming(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// GOFRAME-IS-VERY-NICE-TO-USE
+}
+
+func ExampleCaseSnake() {
+	var str string
+	str = `goframe_is Very Nice.to-use`
+	rsStr := gstr.CaseSnake(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe_is_very_nice_to_use
+}
+
+func ExampleCaseSnakeFirstUpper() {
+	var str string
+	str = `GoframeIsVeryNiceToUse`
+	rsStr := gstr.CaseSnakeFirstUpper(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe_is_very_nice_to_use
+}
+
+func ExampleCaseSnakeScreaming() {
+	var str string
+	str = `goframe_is Very Nice.to-use`
+	rsStr := gstr.CaseSnakeScreaming(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// GOFRAME_IS_VERY_NICE_TO_USE
+}
+
+func ExampleChr() {
+	var ascii int
+	ascii = 65
+	rsStr := gstr.Chr(ascii)
+	fmt.Println(rsStr)
+
+	// Output:
+	// A
+}
+
+func ExampleChunkSplit() {
+	var body string
+	var chunkLen int
+	var end string
+	body = `1234`
+	chunkLen = 2
+	end = "#"
+	rsStr := gstr.ChunkSplit(body, chunkLen, end)
+	fmt.Println(rsStr)
+
+	body = `我爱Goframe`
+	chunkLen = 1
+	end = "-"
+	rsStr = gstr.ChunkSplit(body, chunkLen, end)
+	fmt.Println(rsStr)
+
+	body = `1234`
+	chunkLen = 1
+	end = ""
+	rsStr = gstr.ChunkSplit(body, chunkLen, end)
+	fmt.Println(rsStr)
+
+	// May Output:
+	// 12#34#
+	// 我-爱-G-o-f-r-a-m-e-
+	// "1\r\n2\r\n3\r\n4\r\n"
+}
+
+func ExampleCompare() {
+	var a string
+	var b string
+
+	a = "C"
+	b = "C"
+	rsStr := gstr.Compare(a, b)
+	fmt.Println(rsStr)
+
+	a = "A"
+	b = "B"
+	rsStr = gstr.Compare(a, b)
+	fmt.Println(rsStr)
+
+	a = "C"
+	b = "B"
+	rsStr = gstr.Compare(a, b)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 0
+	// -1
+	// 1
+}
+
+func ExampleCompareVersion() {
+	var a string
+	var b string
+
+	a = "v2.11.9"
+	b = "v2.10.8"
+
+	rsStr := gstr.CompareVersion(a, b)
+	fmt.Println(rsStr)
+
+	a = "A.10.8"
+	b = "A.19.7"
+	rsStr = gstr.CompareVersion(a, b)
+	fmt.Println(rsStr)
+
+	a = "2.8.beta"
+	b = "2.8"
+	rsStr = gstr.CompareVersion(a, b)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 1
+	// -1
+	// 0
+}
+
+func ExampleCompareVersionGo() {
+	var a string
+	var b string
+
+	a = "v2.11.9"
+	b = "v2.10.8"
+	rsStr := gstr.CompareVersionGo(a, b)
+	fmt.Println(rsStr)
+
+	a = "v0.0.2-20180626092158-b2ccc119800e"
+	b = "v1.0.1-20190626092158-b2ccc519800e"
+	rsStr = gstr.CompareVersionGo(a, b)
+	fmt.Println(rsStr)
+
+	a = "v4.20.1"
+	b = "v4.20.1+incompatible"
+	rsStr = gstr.CompareVersionGo(a, b)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 1
+	// -1
+	// 0
+}
+
+func ExampleContains() {
+	var str, substr string
+	str = `goframe_is Very Nice.to-use`
+	substr = `goframe`
+	rsStr := gstr.Contains(str, substr)
+	fmt.Println(rsStr)
+
+	substr = `Goframe`
+	rsStr = gstr.Contains(str, substr)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+}
+
+func ExampleContainsAny() {
+	var s, chars string
+	s = `goframe_is Very Nice.to-use`
+	chars = "g"
+	rsStr := gstr.ContainsAny(s, chars)
+	fmt.Println(rsStr)
+
+	chars = "G"
+	rsStr = gstr.ContainsAny(s, chars)
+	fmt.Println(rsStr)
+
+	chars = "Nice"
+	rsStr = gstr.ContainsAny(s, chars)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+	// true
+}
+
+func ExampleContainsI() {
+	var str, substr string
+	str = `goframe_is Very Nice.to-use`
+
+	substr = "go"
+	rsStr := gstr.ContainsI(str, substr)
+	fmt.Println(rsStr)
+
+	substr = "Go"
+	rsStr = gstr.ContainsI(str, substr)
+	fmt.Println(rsStr)
+
+	substr = "Golang"
+	rsStr = gstr.ContainsI(str, substr)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// true
+	// false
+}
+
+func ExampleCount() {
+	var str, substr string
+	str = `goframe_is Very Nice.to-use`
+
+	substr = "goframe"
+	rsStr := gstr.Count(str, substr)
+	fmt.Println(rsStr)
+
+	substr = "golang"
+	rsStr = gstr.Count(str, substr)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 1
+	// 0
+}
+
+func ExampleCountChars() {
+	var str string
+	var noSpace bool
+	str = `goframe_is Very Nice.to-use`
+
+	rsStr := gstr.CountChars(str)
+	fmt.Println(rsStr)
+
+	noSpace = true
+	rsStr = gstr.CountChars(str, noSpace)
+	fmt.Println(rsStr)
+
+	// Output:
+	// map[ :2 -:1 .:1 N:1 V:1 _:1 a:1 c:1 e:4 f:1 g:1 i:2 m:1 o:2 r:2 s:2 t:1 u:1 y:1]
+	// map[-:1 .:1 N:1 V:1 _:1 a:1 c:1 e:4 f:1 g:1 i:2 m:1 o:2 r:2 s:2 t:1 u:1 y:1]
+}
+
+func ExampleCountI() {
+	var s, substr string
+	s = `goframe_is Very Nice.to-use`
+
+	substr = "goframe"
+	rsStr := gstr.CountI(s, substr)
+	fmt.Println(rsStr)
+
+	substr = "golang"
+	rsStr = gstr.CountI(s, substr)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 1
+	// 0
+}
+
+func ExampleCountWords() {
+	var str string
+	str = `goframe is Very Nice to use ! goframe Very Nice !`
+	rsStr := gstr.CountWords(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// map[!:2 Nice:2 Very:2 goframe:2 is:1 to:1 use:1]
+}
+
+func ExampleEqual() {
+	var a, b string
+	a = `A`
+	b = `a`
+	rsStr := gstr.Equal(a, b)
+	fmt.Println(rsStr)
+
+	a = `A`
+	b = `B`
+	rsStr = gstr.Equal(a, b)
+	fmt.Println(rsStr)
+
+	a = `C`
+	b = `B`
+	rsStr = gstr.Equal(a, b)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+	// false
+}
+
+func ExampleExplode() {
+	var delimiter, str string
+	str = `goframe_is_Very_Nice_to_use`
+	delimiter = "_"
+	rsStr := gstr.Explode(delimiter, str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// [goframe is Very Nice to use]
+}
+
+func ExampleFields() {
+	var str string
+	str = `goframe is Very Nice to-use`
+	rsStr := gstr.Fields(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// [goframe is Very Nice to-use]
+}
+
+func ExampleHasPrefix() {
+	var s, prefix string
+	s = `goframe_is Very Nice.to-use`
+
+	prefix = "goframe"
+	rsStr := gstr.HasPrefix(s, prefix)
+	fmt.Println(rsStr)
+
+	prefix = "Goframe"
+	rsStr = gstr.HasPrefix(s, prefix)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+}
+
+func ExampleHasSuffix() {
+	var s, prefix string
+	s = `goframe_is Very Nice.to-use`
+
+	prefix = "use"
+	rsStr := gstr.HasSuffix(s, prefix)
+	fmt.Println(rsStr)
+
+	prefix = "Use"
+	rsStr = gstr.HasSuffix(s, prefix)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+}
+
+func ExampleHideStr() {
+	var str string
+	var percent int
+	var hide string
+
+	str = `1234567890`
+	percent = 30
+	hide = `@`
+	rsStr := gstr.HideStr(str, percent, hide)
+	fmt.Println(rsStr)
+
+	str = `AAAAAAAAAA`
+	percent = 60
+	hide = `@`
+	rsStr = gstr.HideStr(str, percent, hide)
+	fmt.Println(rsStr)
+
+	str = `ABCDEFGHIJ`
+	percent = 10
+	hide = `@`
+	rsStr = gstr.HideStr(str, percent, hide)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 1234@@@890
+	// AA@@@@@@AA
+	// ABCDE@GHIJ
+}
+
+func ExampleImplode() {
+	var glue string
+	var pieces []string
+	pieces = []string{"goframe", "is", "Very", "Nice", "to", "use"}
+	glue = "-"
+	rsStr := gstr.Implode(glue, pieces)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe-is-Very-Nice-to-use
+}
+
+func ExampleInArray() {
+	var a []string
+	var s string
+	a = []string{"goframe", "is", "Very", "Nice", "to", "use"}
+	s = "goframe"
+	rsStr := gstr.InArray(a, s)
+	fmt.Println(rsStr)
+
+	s = "golang"
+	rsStr = gstr.InArray(a, s)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+}
+
+func ExampleIsLetterLower() {
+	var b byte
+	b = 65 // In ASCII is "a"
+	rsStr := gstr.IsLetterLower(b)
+	fmt.Println(rsStr)
+
+	b = 97 // In ASCII is "A"
+	rsStr = gstr.IsLetterLower(b)
+	fmt.Println(rsStr)
+
+	// Output:
+	// false
+	// true
+}
+
+func ExampleIsLetterUpper() {
+	var b byte
+	b = 65 // In ASCII is "a"
+	rsStr := gstr.IsLetterUpper(b)
+	fmt.Println(rsStr)
+
+	b = 97 // In ASCII is "A"
+	rsStr = gstr.IsLetterUpper(b)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+}
+
+func ExampleIsNumeric() {
+	var s string
+
+	s = "88"
+	rsStr := gstr.IsNumeric(s)
+	fmt.Println(rsStr)
+
+	s = "aa66bb88"
+	rsStr = gstr.IsNumeric(s)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// false
+}
+
+func ExampleIsSubDomain() {
+	var subDomain, mainDomain string
+
+	subDomain = `s.goframe.org`
+	mainDomain = `goframe.org`
+	rsStr := gstr.IsSubDomain(subDomain, mainDomain)
+	fmt.Println(rsStr)
+
+	subDomain = `s.s.goframe.org`
+	mainDomain = `goframe.org`
+	rsStr = gstr.IsSubDomain(subDomain, mainDomain)
+	fmt.Println(rsStr)
+
+	subDomain = `s.s.goframe.org`
+	mainDomain = `*goframe.org`
+	rsStr = gstr.IsSubDomain(subDomain, mainDomain)
+	fmt.Println(rsStr)
+
+	// Output:
+	// true
+	// true
+	// false
+}
+
+func ExampleJoin() {
+	var array []string
+	var sep string
+
+	array = []string{"goframe", "is", "Very", "Nice", "to", "use"}
+	sep = `,`
+	rsStr := gstr.Join(array, sep)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe,is,Very,Nice,to,use
+}
+
+func ExampleJoinAny() {
+	var sep string
+
+	sep = `@`
+	arr1 := []string{"goframe", "is", "Very", "Nice", "to", "use"}
+	rsStr := gstr.JoinAny(arr1, sep)
+	fmt.Println(rsStr)
+
+	sep = `|`
+	type StructA struct {
+		Name string
+		Age  int
+	}
+	arr2 := []StructA{
+		{"Mary", 18},
+		{"Jack", 18},
+		{"Lucy", 18},
+	}
+	rsStr = gstr.JoinAny(arr2, sep)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe@is@Very@Nice@to@use
+	// {"Name":"Mary","Age":18}|{"Name":"Jack","Age":18}|{"Name":"Lucy","Age":18}
+}
+
+func ExampleLcFirst() {
+	var str string
+	str = `Goframe`
+	rsStr := gstr.LcFirst(str)
+	fmt.Println(rsStr)
+
+	str = `Goframe is Very Nice to use.`
+	rsStr = gstr.LcFirst(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe
+	// goframe is Very Nice to use.
+}
+
+func ExampleLenRune() {
+	var str string
+	str = `goframe is Very Nice to use`
+	rsStr := gstr.LenRune(str)
+	fmt.Println(rsStr)
+
+	str = `123 4567 890`
+	rsStr = gstr.LenRune(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 27
+	// 12
+}
+
+func ExampleLevenshtein() {
+	var str1, str2 string
+	var costIns, costRep, costDel int
+	str1 = "Hello World"
+	str2 = "ello World"
+
+	costIns = 1
+	costRep = 1
+	costDel = 1
+	rsStr := gstr.Levenshtein(str1, str2, costIns, costRep, costDel)
+	fmt.Println(rsStr)
+
+	str1 = "Hello World"
+	str2 = "ello Worles"
+	costIns = 10
+	costRep = 20
+	costDel = 30
+	rsStr = gstr.Levenshtein(str1, str2, costIns, costRep, costDel)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 1
+	// 60
+}
+
+func ExampleNl2Br() {
+	var str string
+	str = `goframe
+is
+Very
+Nice
+to
+use`
+	rsStr := gstr.Nl2Br(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe<br>is<br>Very<br>Nice<br>to<br>use
+}
+
+func ExampleNumberFormat() {
+	var number float64
+	var decimals int
+	var decPoint string
+	var thousandsSep string
+
+	number = 123456
+	decimals = 2
+	decPoint = "."
+	thousandsSep = ","
+	rsStr := gstr.NumberFormat(number, decimals, decPoint, thousandsSep)
+	fmt.Println(rsStr)
+
+	number = 1234.56
+	decimals = 1
+	decPoint = ","
+	thousandsSep = " "
+	rsStr = gstr.NumberFormat(number, decimals, decPoint, thousandsSep)
+	fmt.Println(rsStr)
+
+	number = 1234.5678
+	decimals = 3
+	decPoint = "."
+	thousandsSep = ","
+	rsStr = gstr.NumberFormat(number, decimals, decPoint, thousandsSep)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 123,456.00
+	// 1 234,6
+	// 1,234.568
+}
+
+func ExampleOctStr() {
+	var str string
+	str = `\346\200\241`
+	rsStr := gstr.OctStr(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 怡
+}
+
+func ExampleOrd() {
+	var str string
+	str = `goframe`
+	rsStr := gstr.Ord(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 103
+}
+
+func ExampleParse() {
+	var str string
+
+	str = `v1=m&v2=n`
+	rsStr, _ := gstr.Parse(str)
+	fmt.Println(rsStr)
+
+	str = `v[a][a]=m&v[a][b]=n`
+	rsStr, _ = gstr.Parse(str)
+	fmt.Println(rsStr)
+
+	// 目前不支持嵌套切片。
+	str = `v[][]=m&v[][]=n`
+	rsStr, err := gstr.Parse(str)
+	if err != nil {
+		fmt.Println("Error:", err)
+	}
+	fmt.Println(rsStr)
+
+	// 会产生错误
+	str = `v=m&v[a]=n`
+	rsStr, err = gstr.Parse(str)
+	if err != nil {
+		fmt.Println("Error:", err)
+	}
+	fmt.Println(rsStr)
+
+	str = `a .[[b=c`
+	rsStr, _ = gstr.Parse(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// map[v1:m v2:n]
+	// map[v:map[a:map[a:m b:n]]]
+	// map[v:map[]]
+	// Error: expected type 'map[string]interface{}' for key 'v', but got 'string'
+	// map[]
+	// map[a___[b:c]
+}
+
+func ExamplePos() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.Pos(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.Pos(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.Pos(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.Pos(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// -1
+}
+
+func ExamplePosI() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosI(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosI(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosI(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosI(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// 16
+}
+
+func ExamplePosIRune() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosIRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosIRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosIRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosIRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// 16
+}
+
+func ExamplePosR() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosR(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosR(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosR(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosR(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// -1
+}
+
+func ExamplePosRI() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosRI(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosRI(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosRI(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosRI(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// 16
+
+}
+
+func ExamplePosRIRune() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosRIRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosRIRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosRIRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosRIRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// 16
+}
+
+func ExamplePosRRune() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosRRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosRRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosRRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosRRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// -1
+}
+
+func ExamplePosRune() {
+	var haystack, needle string
+	var startOffset int
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `Nice`
+	rsStr := gstr.PosRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	startOffset = 16
+	rsStr = gstr.PosRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	startOffset = 17
+	rsStr = gstr.PosRune(haystack, needle, startOffset)
+	fmt.Println(rsStr)
+
+	needle = `nice`
+	rsStr = gstr.PosRune(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 16
+	// 16
+	// -1
+	// -1
+}
+
+func ExampleQuoteMeta() {
+	var str string
+	str = `.\+?[^]()`
+	rsStr := gstr.QuoteMeta(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// \.\\\+\?\[\^\]\(\)
+
+}
+
+func ExampleRepeat() {
+	var input string
+	var multiplier int
+	input = `goframe `
+	multiplier = 3
+	rsStr := gstr.Repeat(input, multiplier)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe goframe goframe
+}
+
+func ExampleReplace() {
+	var origin, search, replace string
+	var count int
+
+	origin = `goframe_is_Very_Nice_to_use!`
+	search = `_`
+	replace = `+`
+	rsStr := gstr.Replace(origin, search, replace)
+	fmt.Println(rsStr)
+
+	count = 2
+	rsStr = gstr.Replace(origin, search, replace, count)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe+is+Very+Nice+to+use!
+	// goframe+is+Very_Nice_to_use!
+}
+
+func ExampleReplaceByArray() {
+	var origin string
+	var array []string
+
+	origin = `Golang is Very Good`
+
+	array = []string{"o", "O"}
+	rsStr := gstr.ReplaceByArray(origin, array)
+	fmt.Println(rsStr)
+
+	array = []string{"Golang", "Goframe", "Good", "Nice"}
+	rsStr = gstr.ReplaceByArray(origin, array)
+	fmt.Println(rsStr)
+
+	// Output:
+	// GOlang is Very GOOd
+	// Goframe is Very Nice
+}
+
+func ExampleReplaceByMap() {
+	var origin string
+	var replaces map[string]string
+
+	origin = `Golang is Very Good`
+
+	replaces = map[string]string{
+		"Golang": "Goframe",
+		"Good":   "Nice",
+	}
+	rsStr := gstr.ReplaceByMap(origin, replaces)
+	fmt.Println(rsStr)
+
+	replaces = map[string]string{
+		"golang": "Goframe",
+		"good":   "Nice",
+	}
+	rsStr = gstr.ReplaceByMap(origin, replaces)
+	fmt.Println(rsStr)
+
+	// Output:
+	// Goframe is Very Nice
+	// Golang is Very Good
+}
+
+func ExampleReplaceI() {
+	var origin, search, replace string
+	var count int
+	origin = `goframe_is Very Nice.to-use`
+	search = `goframe`
+	replace = `golang`
+	count = 3
+	rsStr := gstr.ReplaceI(origin, search, replace, count)
+	fmt.Println(rsStr)
+
+	// Output:
+	//
+}
+
+func ExampleReplaceIByArray() {
+	var origin string
+	var replaces []string
+	replaces = []string{
+		"frame",
+		"lang",
+		"nice",
+		"goframe",
+	}
+	origin = `goframe Nice`
+	rsStr := gstr.ReplaceIByArray(origin, replaces)
+	fmt.Println(rsStr)
+
+	// Output:
+	// golang goframe
+}
+
+func ExampleReplaceIByMap() {
+	var origin string
+	var replaces map[string]string
+
+	origin = `Golang is Very Good`
+
+	replaces = map[string]string{
+		"Golang": "Goframe",
+		"Good":   "Nice",
+	}
+	rsStr := gstr.ReplaceIByMap(origin, replaces)
+	fmt.Println(rsStr)
+
+	replaces = map[string]string{
+		"golang": "Goframe",
+		"good":   "Nice",
+	}
+	rsStr = gstr.ReplaceIByMap(origin, replaces)
+	fmt.Println(rsStr)
+
+	// Output:
+	// Goframe is Very Nice
+	// Goframe is Very Nice
+}
+
+func ExampleReverse() {
+	var str string
+	str = `Goframe-Nice`
+	rsStr := gstr.Reverse(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// eciN-emarfoG
+}
+
+func ExampleSearchArray() {
+	var a []string
+	var s string
+	a = []string{
+		"goframe",
+		"is",
+		"Very",
+		"Nice",
+	}
+	s = `goframe`
+	rsStr := gstr.SearchArray(a, s)
+	fmt.Println(rsStr)
+
+	s = `Very`
+	rsStr = gstr.SearchArray(a, s)
+	fmt.Println(rsStr)
+
+	s = `use`
+	rsStr = gstr.SearchArray(a, s)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 0
+	// 2
+	// -1
+}
+
+func ExampleShuffle() {
+	var str string
+	str = `goframe_is Nice.`
+	rsStr := gstr.Shuffle(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// frg.omeie sa_cNi
+}
+
+func ExampleSimilarText() {
+	var first, second string
+	var percent *float64
+	first = `goframe_is`
+	second = `go-nice`
+	rsStr := gstr.SimilarText(first, second, percent)
+	fmt.Println(rsStr)
+
+	// Output:
+	// 3
+}
+
+func ExampleSoundex() {
+	var str string
+	var str2 string
+	str = `Euler`
+	str2 = `Ellery`
+	rsStr := gstr.Soundex(str)
+	rsStr2 := gstr.Soundex(str2)
+	fmt.Println(rsStr, rsStr2)
+
+	str = `Gauss`
+	str2 = `Ghosh`
+	rsStr = gstr.Soundex(str)
+	rsStr2 = gstr.Soundex(str2)
+	fmt.Println(rsStr, rsStr2)
+
+	str = `Lloyd`
+	str2 = `Ladd`
+	rsStr = gstr.Soundex(str)
+	rsStr2 = gstr.Soundex(str2)
+	fmt.Println(rsStr, rsStr2)
+
+	// Output:
+	// E406 E406
+	// G020 G020
+	// L030 L030
+}
+
+func ExampleSplit() {
+	var str, delimiter string
+	str = `GoFrame_Nice`
+	delimiter = `ame_N`
+	rsStr := gstr.Split(str, delimiter)
+	fmt.Println(rsStr)
+
+	// Output:
+	// [GoFr ice]
+}
+
+func ExampleSplitAndTrim() {
+	var str, delimiter, characterMask string
+	str = `    goframe, is,       Very ,Nice ,to,      use`
+	delimiter = `,`
+	characterMask = ` `
+	rsStr := gstr.SplitAndTrim(str, delimiter, characterMask)
+	fmt.Println(rsStr)
+
+	// Output:
+	// [goframe is Very Nice to use]
+}
+
+func ExampleStr() {
+	var haystack, needle string
+	haystack = `goframe nice`
+	needle = `fram`
+	rsStr := gstr.Str(haystack, needle)
+	fmt.Println(rsStr)
+
+	needle = `ame n`
+	rsStr = gstr.Str(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// me nice
+	// nice
+}
+
+func ExampleStrEx() {
+	var haystack, needle string
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `goframe`
+	rsStr := gstr.StrEx(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// _is Very Nice.to-use
+}
+
+func ExampleStrLimit() {
+	var str, suffix string
+	var length int
+	str = `goframe_is Very Nice.to-use`
+	length = 8
+	suffix = "suffix"
+	rsStr := gstr.StrLimit(str, length, suffix)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe_suffix
+}
+
+func ExampleStrLimitRune() {
+	var str, suffix string
+	var length int
+	str = `goframe_is Very Nice.to-use`
+	length = 7
+	suffix = "suffix"
+	rsStr := gstr.StrLimitRune(str, length, suffix)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframesuffix
+}
+
+func ExampleStrTill() {
+	var haystack, needle string
+
+	haystack = `ABCDEFGHIJKLMN`
+	needle = `C`
+	rsStr := gstr.StrTill(haystack, needle)
+	fmt.Println(rsStr)
+
+	needle = `E`
+	rsStr = gstr.StrTill(haystack, needle)
+	fmt.Println(rsStr)
+
+	needle = `G`
+	rsStr = gstr.StrTill(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// ABC
+	// ABCDE
+	// ABCDEFG
+}
+
+func ExampleStrTillEx() {
+	var haystack, needle string
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `frame`
+	rsStr := gstr.StrTillEx(haystack, needle)
+	fmt.Println(rsStr)
+
+	haystack = `goframe_is Very Nice.to-use`
+	needle = `to`
+	rsStr = gstr.StrTillEx(haystack, needle)
+	fmt.Println(rsStr)
+
+	// Output:
+	// go
+	// goframe_is Very Nice.
+}
+
+func ExampleStripSlashes() {
+	var str string
+	str = `goframe "is" Very Nice to use`
+	rsStr := gstr.StripSlashes(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	//
+}
+
+func ExampleSubStr() {
+	var str string
+	var start, length int
+	str = `GoFrame Nice`
+	start = 0
+	length = 2
+	subStr := gstr.SubStr(str, start, length)
+	fmt.Println(subStr)
+
+	str = `GoFrame Nice`
+	start = 5
+	length = 6
+	subStr = gstr.SubStr(str, start, length)
+	fmt.Println(subStr)
+
+	// Output:
+	// Go
+	// me Nic
+}
+
+func ExampleSubStrRune() {
+	var str string
+	var start, length int
+	str = `GoFrame Nice`
+	start = 5
+	length = 4
+	subStr := gstr.SubStrRune(str, start, length)
+	fmt.Println(subStr)
+
+	// Output:
+	// me N
+}
+
+func ExampleToLower() {
+	var s string
+	s = `GoFRAME_IS VERY NICE.TO-USE`
+	rsStr := gstr.ToLower(s)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe_is very nice.to-use
+}
+
+func ExampleToUpper() {
+	var s string
+	s = `goframe_is Very Nice.to-use`
+	rsStr := gstr.ToUpper(s)
+	fmt.Println(rsStr)
+
+	// Output:
+	// GOFRAME_IS VERY NICE.TO-USE
+}
+
+func ExampleTrim() {
+	var str, characterMask string
+	str = `goframe_is Very Nice.to-use`
+	characterMask = "to-use"
+	rsStr := gstr.Trim(str, characterMask)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe_is Very Nice.
+}
+
+func ExampleTrimAll() {
+	var str, characterMask string
+	str = `goframe`
+	characterMask = "g o e"
+	rsStr := gstr.TrimAll(str, characterMask)
+	fmt.Println(rsStr)
+
+	// Output:
+	// fram
+}
+
+func ExampleTrimLeft() {
+	var str, characterMask string
+	str = ` goframe is Very Nice to use`
+	characterMask = "goframeisVery"
+	rsStr := gstr.TrimLeft(str, characterMask)
+	fmt.Println(rsStr)
+
+	// Output:
+	// Nice to use
+}
+
+func ExampleTrimLeftStr() {
+	var str, cut string
+	var count int
+	str = ` goframe is Very Nice.to-use`
+	cut = " go"
+	count = 1
+	rsStr := gstr.TrimLeftStr(str, cut, count)
+	fmt.Println(rsStr)
+
+	// Output:
+	// frame is Very Nice.to-use
+}
+
+func ExampleTrimRight() {
+	var str, characterMask string
+	str = `goframe_is Very Nice to use    `
+	rsStr := gstr.TrimRight(str)
+	fmt.Println(rsStr)
+
+	str = `goframe_is Very Nice to-use    `
+	characterMask = "to-use" // []byte{"t", "o", "-", "u", "s", "e"}
+	rsStr = gstr.TrimRight(str, characterMask)
+	fmt.Println(rsStr)
+
+	// Output:
+	// goframe_is Very Nice to use
+	// goframe_is Very Nic
+}
+
+func ExampleTrimRightStr() {
+	var str, cut string
+	var count int
+	str = `aaa,bbb,ccc,ddd,eee,`
+	cut = ","
+	count = 1
+	rsStr := gstr.TrimRightStr(str, cut, count)
+	fmt.Println(rsStr)
+
+	str = `aaa,bbb,ccc,ddd,eee,,,,,`
+	cut = ","
+	count = -1
+	rsStr = gstr.TrimRightStr(str, cut, count)
+	fmt.Println(rsStr)
+
+	str = `aaa,bbb,ccc,ddd,eee,,,,,   `
+	cut = ","
+	count = -1
+	rsStr = gstr.TrimRightStr(str, cut, count)
+	fmt.Println(rsStr)
+
+	// Output:
+	// aaa,bbb,ccc,ddd,eee
+	// aaa,bbb,ccc,ddd,eee
+	// aaa,bbb,ccc,ddd,eee,,,,,
+}
+
+func ExampleTrimStr() {
+	var str, cut string
+	var count int
+	str = `goframe is Very Nice to-use`
+	cut = "goframe"
+	rsStr := gstr.TrimStr(str, cut, count)
+	fmt.Println(rsStr)
+
+	cut = "use"
+	rsStr = gstr.TrimStr(str, cut, count)
+	fmt.Println(rsStr)
+
+	// Output:
+	// is Very Nice to-use
+	// goframe is Very Nice to-
+}
+
+func ExampleUcFirst() {
+	var s string
+	s = `goframe is very nice to use.`
+	rsStr := gstr.UcFirst(s)
+	fmt.Println(rsStr)
+
+	// Output:
+	// Goframe is very nice to use.
+}
+
+func ExampleUcWords() {
+	var str string
+	str = `goframe is very nice to use.`
+	rsStr := gstr.UcWords(str)
+	fmt.Println(rsStr)
+
+	// Output:
+	// Goframe Is Very Nice To Use.
+}
+
+func ExampleWordWrap() {
+	var str, br string
+	var width int
+	str = `A very long woooooooooooooooooord. and something`
+	width = 8
+	br = "\n"
+	rsStr := gstr.WordWrap(str, width, br)
+	fmt.Println(rsStr)
+
+	str = `The quick brown fox jumped over the lazy dog.`
+	width = 20
+	br = "<br />\n"
+	rsStr = gstr.WordWrap(str, width, br)
+	fmt.Printf("%v", rsStr)
+
+	// Output:
+	// A very
+	// long
+	// woooooooooooooooooord.
+	// and
+	// something
+	// The quick brown fox<br />
+	// jumped over the lazy<br />
+	// dog.
+}