strutil

package
v2.3.3 Latest Latest
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 Go to latest Published: Oct 9, 2024 License: MIT Imports: 8 Imported by: 40

Documentation

Overview

Package strutil implements some functions to manipulate string.

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (
	// DefaultTrimChars are the characters which are stripped by Trim* functions in default.
	DefaultTrimChars = string([]byte{
		'\t',
		'\v',
		'\n',
		'\r',
		'\f',
		' ',
		0x00,
		0x85,
		0xA0,
	})
)

Functions

func After 

func After(s, char string) string

After returns the substring after the first occurrence of a specified string in the source string. Play: https://go.dev/play/p/RbCOQqCDA7m

Example 
result1 := After("foo", "")
result2 := After("foo", "foo")
result3 := After("foo/bar", "foo")
result4 := After("foo/bar", "/")
result5 := After("foo/bar/baz", "/")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

foo

/bar
bar
bar/baz

func AfterLast 

func AfterLast(s, char string) string

AfterLast returns the substring after the last occurrence of a specified string in the source string. Play: https://go.dev/play/p/1TegARrb8Yn

Example 
result1 := AfterLast("foo", "")
result2 := AfterLast("foo", "foo")
result3 := AfterLast("foo/bar", "/")
result4 := AfterLast("foo/bar/baz", "/")
result5 := AfterLast("foo/bar/foo/baz", "foo")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

foo

bar
baz
/baz

func Before 

func Before(s, char string) string

Before returns the substring of the source string up to the first occurrence of the specified string. Play: https://go.dev/play/p/JAWTZDS4F5w

Example 
result1 := Before("foo", "")
result2 := Before("foo", "foo")
result3 := Before("foo/bar", "/")
result4 := Before("foo/bar/baz", "/")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)

Output:

foo

foo
foo

func BeforeLast 

func BeforeLast(s, char string) string

BeforeLast returns the substring of the source string up to the last occurrence of the specified string. Play: https://go.dev/play/p/pJfXXAoG_Te

Example 
result1 := BeforeLast("foo", "")
result2 := BeforeLast("foo", "foo")
result3 := BeforeLast("foo/bar", "/")
result4 := BeforeLast("foo/bar/baz", "/")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)

Output:

foo

foo
foo/bar

func BytesToString added in v2.1.20 

func BytesToString(bytes []byte) string

BytesToString converts a byte slice to string without a memory allocation. Play: https://go.dev/play/p/6c68HRvJecH

Example 
bytes := []byte{'a', 'b', 'c'}
result := BytesToString(bytes)

fmt.Println(result)

Output:

abc

func CamelCase 

func CamelCase(s string) string

CamelCase coverts string to camelCase string. Non letters and numbers will be ignored. Play: https://go.dev/play/p/9eXP3tn2tUy

Example 
strings := []string{"", "foobar", "&FOO:BAR$BAZ", "$foo%", "Foo-#1😄$_%^&*(1bar"}

for _, v := range strings {
	s := CamelCase(v)
	fmt.Println(s)
}

Output:


foobar
fooBarBaz
foo
foo11Bar

func Capitalize 

func Capitalize(s string) string

Capitalize converts the first character of a string to upper case and the remaining to lower case. Play: https://go.dev/play/p/2OAjgbmAqHZ

Example 
strings := []string{"", "Foo", "_foo", "fooBar", "foo-bar"}

for _, v := range strings {
	s := Capitalize(v)
	fmt.Println(s)
}

Output:


Foo
_foo
Foobar
Foo-bar

func Concat added in v2.3.1 

func Concat(length int, str ...string) string

Concat uses the strings.Builder to concatenate the input strings.

  • `length` is the expected length of the concatenated string.
  • if you are unsure about the length of the string to be concatenated, please pass 0 or a negative number.

Play: todo

Example 
result1 := Concat(12, "Hello", " ", "World", "!")
result2 := Concat(11, "Go", " ", "Language")
result3 := Concat(0, "An apple a ", "day，", "keeps the", " doctor away")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)

Output:

Hello World!
Go Language
An apple a day，keeps the doctor away

func ContainsAll added in v2.2.1 

func ContainsAll(str string, substrs []string) bool

ContainsAll return true if target string contains all the substrs. Play: https://go.dev/play/p/KECtK2Os4zq

Example 
str := "hello world"

result1 := ContainsAll(str, []string{"hello", "world"})
result2 := ContainsAll(str, []string{"hello", "abc"})

fmt.Println(result1)
fmt.Println(result2)

Output:

true
false

func ContainsAny added in v2.2.1 

func ContainsAny(str string, substrs []string) bool

ContainsAny return true if target string contains any one of the substrs. Play: https://go.dev/play/p/dZGSSMB3LXE

Example 
str := "hello world"

result1 := ContainsAny(str, []string{"hello", "world"})
result2 := ContainsAny(str, []string{"hello", "abc"})
result3 := ContainsAny(str, []string{"123", "abc"})

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)

Output:

true
true
false

func Ellipsis added in v2.3.3 

func Ellipsis(str string, length int) string

Ellipsis truncates a string to a specified length and appends an ellipsis. Play: todo

Example 
result1 := Ellipsis("hello world", 5)
result2 := Ellipsis("你好，世界!", 2)
result3 := Ellipsis("😀😃😄😁😆", 3)

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)

Output:

hello...
你好...
😀😃😄...

func HammingDistance added in v2.3.0 

func HammingDistance(a, b string) (int, error)

HammingDistance calculates the Hamming distance between two strings. The Hamming distance is the number of positions at which the corresponding symbols are different. This func returns an error if the input strings are of unequal lengths. Play: https://go.dev/play/p/glNdQEA9HUi

Example 
result, _ := HammingDistance("abc", "def")
fmt.Println(result)

result, _ = HammingDistance("name", "namf")
fmt.Println(result)

Output:

3
1

func HasPrefixAny added in v2.1.20 

func HasPrefixAny(str string, prefixes []string) bool

HasPrefixAny check if a string starts with any of a slice of specified strings. Play: https://go.dev/play/p/8UUTl2C5slo

Example 
result1 := HasPrefixAny("foo bar", []string{"fo", "xyz", "hello"})
result2 := HasPrefixAny("foo bar", []string{"oom", "world"})

fmt.Println(result1)
fmt.Println(result2)

Output:

true
false

func HasSuffixAny added in v2.1.20 

func HasSuffixAny(str string, suffixes []string) bool

HasSuffixAny check if a string ends with any of a slice of specified strings. Play: https://go.dev/play/p/sKWpCQdOVkx

Example 
result1 := HasSuffixAny("foo bar", []string{"bar", "xyz", "hello"})
result2 := HasSuffixAny("foo bar", []string{"oom", "world"})

fmt.Println(result1)
fmt.Println(result2)

Output:

true
false

func HideString added in v2.2.1 

func HideString(origin string, start, end int, replaceChar string) string

HideString hide some chars in source string with param `replaceChar`. replace range is origin[start : end]. [start, end) Play: https://go.dev/play/p/pzbaIVCTreZ)

Example 
str := "13242658976"

result1 := HideString(str, 3, 3, "*")
result2 := HideString(str, 3, 4, "*")
result3 := HideString(str, 3, 7, "*")
result4 := HideString(str, 7, 11, "*")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)

Output:

13242658976
132*2658976
132****8976
1324265****

func IndexOffset added in v2.1.20 

func IndexOffset(str string, substr string, idxFrom int) int

IndexOffset returns the index of the first instance of substr in string after offsetting the string by `idxFrom`, or -1 if substr is not present in string. Play: https://go.dev/play/p/qZo4lV2fomB

Example 
str := "foo bar hello world"

result1 := IndexOffset(str, "o", 5)
result2 := IndexOffset(str, "o", 0)
result3 := IndexOffset(str, "d", len(str)-1)
result4 := IndexOffset(str, "d", len(str))
result5 := IndexOffset(str, "f", -1)

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

12
1
18
-1
-1

func IsBlank added in v2.1.20 

func IsBlank(str string) bool

IsBlank checks if a string is whitespace, empty. Play: https://go.dev/play/p/6zXRH_c0Qd3

Example 
result1 := IsBlank("")
result2 := IsBlank("\t\v\f\n")
result3 := IsBlank(" 中文")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)

Output:

true
true
false

func IsNotBlank added in v2.2.7 

func IsNotBlank(str string) bool

IsNotBlank checks if a string is not whitespace, not empty. Play: https://go.dev/play/p/e_oJW0RAquA

Example 
result1 := IsNotBlank("")
result2 := IsNotBlank("			")
result3 := IsNotBlank("\t\v\f\n")
result4 := IsNotBlank(" 中文")
result5 := IsNotBlank(" 	world	")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

false
false
false
true
true

func IsString 

func IsString(v any) bool

IsString check if the value data type is string or not. Play: https://go.dev/play/p/IOgq7oF9ERm

Example 
result1 := IsString("")
result2 := IsString("a")
result3 := IsString(1)
result4 := IsString(true)
result5 := IsString([]string{"a"})

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

true
true
false
false
false

func KebabCase 

func KebabCase(s string) string

KebabCase coverts string to kebab-case, non letters and numbers will be ignored. Play: https://go.dev/play/p/dcZM9Oahw-Y

Example 
strings := []string{"", "foo-bar", "Foo Bar-", "FOOBAR", "Foo-#1😄$_%^&*(1bar"}

for _, v := range strings {
	s := KebabCase(v)
	fmt.Println(s)
}

Output:


foo-bar
foo-bar
foobar
foo-1-1-bar

func LowerFirst 

func LowerFirst(s string) string

LowerFirst converts the first character of string to lower case. Play: https://go.dev/play/p/CbzAyZmtJwL

Example 
strings := []string{"", "bar", "BAr", "Bar大"}

for _, v := range strings {
	s := LowerFirst(v)
	fmt.Println(s)
}

Output:


bar
bAr
bar大

func Pad added in v2.1.16 

func Pad(source string, size int, padStr string) string

Pad pads string on the left and right side if it's shorter than size. Padding characters are truncated if they exceed size. Play: https://go.dev/play/p/NzImQq-VF8q

Example 
result1 := Pad("foo", 1, "bar")
result2 := Pad("foo", 2, "bar")
result3 := Pad("foo", 3, "bar")
result4 := Pad("foo", 4, "bar")
result5 := Pad("foo", 5, "bar")
result6 := Pad("foo", 6, "bar")
result7 := Pad("foo", 7, "bar")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
fmt.Println(result7)

Output:

foo
foo
foo
foob
bfoob
bfooba
bafooba

func PadEnd 

func PadEnd(source string, size int, padStr string) string

PadEnd pads string on the right side if it's shorter than size. Padding characters are truncated if they exceed size. Play: https://go.dev/play/p/9xP8rN0vz--

Example 
result1 := PadEnd("foo", 1, "bar")
result2 := PadEnd("foo", 2, "bar")
result3 := PadEnd("foo", 3, "bar")
result4 := PadEnd("foo", 4, "bar")
result5 := PadEnd("foo", 5, "bar")
result6 := PadEnd("foo", 6, "bar")
result7 := PadEnd("foo", 7, "bar")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
fmt.Println(result7)

Output:

foo
foo
foo
foob
fooba
foobar
foobarb

func PadStart 

func PadStart(source string, size int, padStr string) string

PadStart pads string on the left side if it's shorter than size. Padding characters are truncated if they exceed size. Play: https://go.dev/play/p/xpTfzArDfvT

Example 
result1 := PadStart("foo", 1, "bar")
result2 := PadStart("foo", 2, "bar")
result3 := PadStart("foo", 3, "bar")
result4 := PadStart("foo", 4, "bar")
result5 := PadStart("foo", 5, "bar")
result6 := PadStart("foo", 6, "bar")
result7 := PadStart("foo", 7, "bar")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
fmt.Println(result7)

Output:

foo
foo
foo
bfoo
bafoo
barfoo
barbfoo

func RegexMatchAllGroups added in v2.3.3 

func RegexMatchAllGroups(pattern, str string) [][]string

RegexMatchAllGroups Matches all subgroups in a string using a regular expression and returns the result. Play: todo

Example 
pattern := `(\w+\.+\w+)@(\w+)\.(\w+)`
str := "Emails: john.doe@example.com and jane.doe@example.com"

result := RegexMatchAllGroups(pattern, str)

fmt.Println(result[0])
fmt.Println(result[1])

Output:

[john.doe@example.com john.doe example com]
[jane.doe@example.com jane.doe example com]

func RemoveNonPrintable added in v2.1.18 

func RemoveNonPrintable(str string) string

RemoveNonPrintable remove non-printable characters from a string. Play: https://go.dev/play/p/og47F5x_jTZ

Example 
result1 := RemoveNonPrintable("hello\u00a0 \u200bworld\n")
result2 := RemoveNonPrintable("你好😄")

fmt.Println(result1)
fmt.Println(result2)

Output:

hello world
你好😄

func RemoveWhiteSpace added in v2.2.2 

func RemoveWhiteSpace(str string, repalceAll bool) string

RemoveWhiteSpace remove whitespace characters from a string. when set repalceAll is true removes all whitespace, false only replaces consecutive whitespace characters with one space. Play: https://go.dev/play/p/HzLC9vsTwkf

Example 
str := " hello   \r\n	\t   world"

result1 := RemoveWhiteSpace(str, true)
result2 := RemoveWhiteSpace(str, false)

fmt.Println(result1)
fmt.Println(result2)

Output:

helloworld
hello world

func ReplaceWithMap added in v2.2.0 

func ReplaceWithMap(str string, replaces map[string]string) string

ReplaceWithMap returns a copy of `str`, which is replaced by a map in unordered way, case-sensitively. Play: https://go.dev/play/p/h3t7CNj2Vvu

Example 
str := "ac ab ab ac"
replaces := map[string]string{
	"a": "1",
	"b": "2",
}

result := ReplaceWithMap(str, replaces)

fmt.Println(result)

Output:

1c 12 12 1c

func Reverse added in v2.1.5 

func Reverse(s string) string

Reverse returns string whose char order is reversed to the given string. Play: https://go.dev/play/p/adfwalJiecD

Example 
s := "foo"
rs := Reverse(s)

fmt.Println(s)
fmt.Println(rs)

Output:

foo
oof

func Rotate added in v2.3.3 

func Rotate(str string, shift int) string

Rotate rotates the string by the specified number of characters. Play: todo

Example 
result1 := Rotate("Hello", 0)
result2 := Rotate("Hello", 1)
result3 := Rotate("Hello", 2)

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)

Output:

Hello
oHell
loHel

func Shuffle added in v2.3.3 

func Shuffle(str string) string

Shuffle the order of characters of given string. Play: todo

func SnakeCase 

func SnakeCase(s string) string

SnakeCase coverts string to snake_case, non letters and numbers will be ignored Play: https://go.dev/play/p/tgzQG11qBuN

Example 
strings := []string{"", "foo-bar", "Foo Bar-", "FOOBAR", "Foo-#1😄$_%^&*(1bar"}

for _, v := range strings {
	s := SnakeCase(v)
	fmt.Println(s)
}

Output:


foo_bar
foo_bar
foobar
foo_1_1_bar

func SplitAndTrim added in v2.2.0 

func SplitAndTrim(str, delimiter string, characterMask ...string) []string

SplitAndTrim splits string `str` by a string `delimiter` to a slice, and calls Trim to every element of this slice. It ignores the elements which are empty after Trim. Play: https://go.dev/play/p/ZNL6o4SkYQ7

Example 
str := " a,b, c,d,$1 "

result1 := SplitAndTrim(str, ",")
result2 := SplitAndTrim(str, ",", "$")

fmt.Println(result1)
fmt.Println(result2)

Output:

[a b c d $1]
[a b c d 1]

func SplitEx added in v2.0.6 

func SplitEx(s, sep string, removeEmptyString bool) []string

SplitEx split a given string which can control the result slice contains empty string or not. Play: https://go.dev/play/p/Us-ySSbWh-3

Example 
result1 := SplitEx(" a b c ", "", true)

result2 := SplitEx(" a b c ", " ", false)
result3 := SplitEx(" a b c ", " ", true)

result4 := SplitEx("a = b = c = ", " = ", false)
result5 := SplitEx("a = b = c = ", " = ", true)

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

[]
[ a b c ]
[a b c]
[a b c ]
[a b c]

func SplitWords added in v2.1.16 

func SplitWords(s string) []string

SplitWords splits a string into words, word only contains alphabetic characters. Play: https://go.dev/play/p/KLiX4WiysMM

Example 
result1 := SplitWords("a word")
result2 := SplitWords("I'am a programmer")
result3 := SplitWords("a -b-c' 'd'e")
result4 := SplitWords("你好，我是一名码农")
result5 := SplitWords("こんにちは，私はプログラマーです")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

[a word]
[I'am a programmer]
[a b-c' d'e]
[]
[]

func StringToBytes added in v2.1.20 

func StringToBytes(str string) (b []byte)

StringToBytes converts a string to byte slice without a memory allocation. Play: https://go.dev/play/p/7OyFBrf9AxA

Example 
result1 := StringToBytes("abc")
result2 := reflect.DeepEqual(result1, []byte{'a', 'b', 'c'})

fmt.Println(result1)
fmt.Println(result2)

Output:

[97 98 99]
true

func SubInBetween added in v2.3.0 

func SubInBetween(str string, start string, end string) string

SubInBetween return substring between the start and end position(excluded) of source string. Play: https://go.dev/play/p/EDbaRvjeNsv

Example 
str := "abcde"

result1 := SubInBetween(str, "", "de")
result2 := SubInBetween(str, "a", "d")

fmt.Println(result1)
fmt.Println(result2)

Output:

abc
bc

func Substring added in v2.1.13 

func Substring(s string, offset int, length uint) string

Substring returns a substring of the specified length starting at the specified offset position. Play: https://go.dev/play/p/q3sM6ehnPDp

Example 
result1 := Substring("abcde", 1, 3)
result2 := Substring("abcde", 1, 5)
result3 := Substring("abcde", -1, 3)
result4 := Substring("abcde", -2, 2)
result5 := Substring("abcde", -2, 3)
result6 := Substring("你好，欢迎你", 0, 2)

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)

Output:

bcd
bcde
e
de
de
你好

func TemplateReplace added in v2.3.3 

func TemplateReplace(template string, data map[string]string) string

TemplateReplace replaces the placeholders in the template string with the corresponding values in the data map. The placeholders are enclosed in curly braces, e.g. {key}. for example, the template string is "Hello, {name}!", and the data map is {"name": "world"}, the result will be "Hello, world!". Play: todo

Example 
template := `Hello, my name is {name}, I'm {age} years old.`
data := map[string]string{
	"name": "Bob",
	"age":  "20",
}

result := TemplateReplace(template, data)

fmt.Println(result)

Output:

Hello, my name is Bob, I'm 20 years old.

func Trim added in v2.2.0 

func Trim(str string, characterMask ...string) string

Trim strips whitespace (or other characters) from the beginning and end of a string. The optional parameter `characterMask` specifies the additional stripped characters. Play: https://go.dev/play/p/Y0ilP0NRV3j

Example 
result1 := Trim("\nabcd")

str := "$ ab	cd $ "

result2 := Trim(str)
result3 := Trim(str, "$")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)

Output:

abcd
$ ab	cd $
ab	cd

func Unwrap 

func Unwrap(str string, wrapToken string) string

Unwrap a given string from anther string. will change source string. Play: https://go.dev/play/p/Ec2q4BzCpG-

Example 
result1 := Unwrap("foo", "")
result2 := Unwrap("*foo*", "*")
result3 := Unwrap("*foo", "*")
result4 := Unwrap("foo*", "*")
result5 := Unwrap("**foo**", "*")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

foo
foo
*foo
foo*
*foo*

func UpperFirst 

func UpperFirst(s string) string

UpperFirst converts the first character of string to upper case. Play: https://go.dev/play/p/sBbBxRbs8MM

Example 
strings := []string{"", "bar", "BAr", "bar大"}

for _, v := range strings {
	s := UpperFirst(v)
	fmt.Println(s)
}

Output:


Bar
BAr
Bar大

func UpperKebabCase added in v2.1.12 

func UpperKebabCase(s string) string

UpperKebabCase coverts string to upper KEBAB-CASE, non letters and numbers will be ignored Play: https://go.dev/play/p/zDyKNneyQXk

Example 
strings := []string{"", "foo-bar", "Foo Bar-", "FooBAR", "Foo-#1😄$_%^&*(1bar"}

for _, v := range strings {
	s := UpperKebabCase(v)
	fmt.Println(s)
}

Output:


FOO-BAR
FOO-BAR
FOO-BAR
FOO-1-1-BAR

func UpperSnakeCase added in v2.1.12 

func UpperSnakeCase(s string) string

UpperSnakeCase coverts string to upper SNAKE_CASE, non letters and numbers will be ignored Play: https://go.dev/play/p/4COPHpnLx38

Example 
strings := []string{"", "foo-bar", "Foo Bar-", "FooBAR", "Foo-#1😄$_%^&*(1bar"}

for _, v := range strings {
	s := UpperSnakeCase(v)
	fmt.Println(s)
}

Output:


FOO_BAR
FOO_BAR
FOO_BAR
FOO_1_1_BAR

func WordCount added in v2.1.16 

func WordCount(s string) int

WordCount return the number of meaningful word, word only contains alphabetic characters. Play: https://go.dev/play/p/bj7_odx3vRf

Example 
result1 := WordCount("a word")
result2 := WordCount("I'am a programmer")
result3 := WordCount("a -b-c' 'd'e")
result4 := WordCount("你好，我是一名码农")
result5 := WordCount("こんにちは，私はプログラマーです")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)

Output:

2
3
3
0
0

func Wrap 

func Wrap(str string, wrapWith string) string

Wrap a string with given string. Play: https://go.dev/play/p/KoZOlZDDt9y

Example 
result1 := Wrap("foo", "")
result2 := Wrap("foo", "*")
result3 := Wrap("'foo'", "'")
result4 := Wrap("", "*")

fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)

Output:

foo
*foo*
''foo''

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