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Strutil ​

Package strutil contains some functions to manipulate string.

Source: ​

Usage: ​

go
import (
    "github.com/duke-git/lancet/v2/strutil"
)

Index ​

Documentation ​

After ​

Returns the substring after the first occurrence of a specified string in the source string.

Signature:

go
func After(s, char string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.After("foo", "")
    result2 := strutil.After("foo", "foo")
    result3 := strutil.After("foo/bar", "foo")
    result4 := strutil.After("foo/bar", "/")
    result5 := strutil.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
}

AfterLast ​

Returns the substring after the last occurrence of a specified string in the source string.

Signature:

go
func AfterLast(s, char string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.AfterLast("foo", "")
    result2 := strutil.AfterLast("foo", "foo")
    result3 := strutil.AfterLast("foo/bar", "/")
    result4 := strutil.AfterLast("foo/bar/baz", "/")
    result5 := strutil.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
}

Before ​

Returns the substring of the source string up to the first occurrence of the specified string.

Signature:

go
func Before(s, char string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Before("foo", "")
    result2 := strutil.Before("foo", "foo")
    result3 := strutil.Before("foo/bar", "/")
    result4 := strutil.Before("foo/bar/baz", "/")

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

    // Output:
    // foo
    //
    // foo
    // foo
}

BeforeLast ​

Returns the substring of the source string up to the last occurrence of the specified string.

Signature:

go
func BeforeLast(s, char string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.BeforeLast("foo", "")
    result2 := strutil.BeforeLast("foo", "foo")
    result3 := strutil.BeforeLast("foo/bar", "/")
    result4 := strutil.BeforeLast("foo/bar/baz", "/")

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

    // Output:
    // foo
    //
    // foo
    // foo/bar
}

CamelCase ​

Coverts string to camelCase string, non letters and numbers will be ignored.

Signature:

go
func CamelCase(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    //
    // foobar
    // fooBarBaz
    // foo
    // foo11Bar
}

KebabCase ​

KebabCase covert string to kebab-case, non letters and numbers will be ignored.

Signature:

go
func KebabCase(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    //
    // foo-bar
    // foo-bar
    // foobar
    // foo-1-1-bar
}

UpperKebabCase ​

UpperKebabCase covert string to upper KEBAB-CASE, non letters and numbers will be ignored.

Signature:

go
func UpperKebabCase(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    //
    // FOO-BAR
    // FOO-BAR
    // FOO-BAR
    // FOO-1-1-BAR
}

Capitalize ​

Convert the first character of a string to upper case.

Signature:

go
func Capitalize(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    strings := []string{"", "Foo", "_foo", "fooBar", "foo-bar"}

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

    // Output:
    //
    // Foo
    // _foo
    // Foobar
    // Foo-bar
}

IsString ​

Check if the value's data type is string.

Signature:

go
func IsString(v any) bool

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.IsString("")
    result2 := strutil.IsString("a")
    result3 := strutil.IsString(1)
    result4 := strutil.IsString(true)
    result5 := strutil.IsString([]string{"a"})

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

    // Output:
    // true
    // true
    // false
    // false
    // false
}

LowerFirst ​

Convert the first character of string to lower case.

Signature:

go
func LowerFirst(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    strings := []string{"", "bar", "BAr", "Bar大"}

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

    // Output:
    //
    // bar
    // bAr
    // bar大
}

UpperFirst ​

Convert the first character of string to upper case.

Signature:

go
func UpperFirst(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    strings := []string{"", "bar", "BAr", "bar大"}

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

    // Output:
    //
    // Bar
    // BAr
    // Bar大
}

Pad ​

Pads string on the left and right side if it's shorter than size.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Pad("foo", 1, "bar")
    result2 := strutil.Pad("foo", 2, "bar")
    result3 := strutil.Pad("foo", 3, "bar")
    result4 := strutil.Pad("foo", 4, "bar")
    result5 := strutil.Pad("foo", 5, "bar")
    result6 := strutil.Pad("foo", 6, "bar")
    result7 := strutil.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
}

PadEnd ​

Pads string on the right side if it's shorter than size.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.PadEnd("foo", 1, "bar")
    result2 := strutil.PadEnd("foo", 2, "bar")
    result3 := strutil.PadEnd("foo", 3, "bar")
    result4 := strutil.PadEnd("foo", 4, "bar")
    result5 := strutil.PadEnd("foo", 5, "bar")
    result6 := strutil.PadEnd("foo", 6, "bar")
    result7 := strutil.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
}

PadStart ​

Pads string on the left side if it's shorter than size.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.PadStart("foo", 1, "bar")
    result2 := strutil.PadStart("foo", 2, "bar")
    result3 := strutil.PadStart("foo", 3, "bar")
    result4 := strutil.PadStart("foo", 4, "bar")
    result5 := strutil.PadStart("foo", 5, "bar")
    result6 := strutil.PadStart("foo", 6, "bar")
    result7 := strutil.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
}

Reverse ​

Return string whose char order is reversed to the given string.

Signature:

go
func Reverse(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    s := "foo"
    rs := strutil.Reverse(s)

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

    // Output:
    // foo
    // oof
}

SnakeCase ​

Coverts string to snake_case, non letters and numbers will be ignored.

Signature:

go
func SnakeCase(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    //
    // foo_bar
    // foo_bar
    // foobar
    // foo_1_1_bar
}

UpperSnakeCase ​

Coverts string to upper snake_case, non letters and numbers will be ignored.

Signature:

go
func UpperSnakeCase(s string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    //
    // FOO_BAR
    // FOO_BAR
    // FOO_BAR
    // FOO_1_1_BAR
}

SplitEx ​

Split a given string whether the result contains empty string.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.SplitEx(" a b c ", "", true)

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

    result4 := strutil.SplitEx("a = b = c = ", " = ", false)
    result5 := strutil.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 ]
}

Substring ​

Returns a substring of the specified length starting at the specified offset position.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Substring("abcde", 1, 3)
    result2 := strutil.Substring("abcde", 1, 5)
    result3 := strutil.Substring("abcde", -1, 3)
    result4 := strutil.Substring("abcde", -2, 2)
    result5 := strutil.Substring("abcde", -2, 3)
    result6 := strutil.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
}

Wrap ​

Wrap a string with given string.

Signature:

go
func Wrap(str string, wrapWith string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Wrap("foo", "")
    result2 := strutil.Wrap("foo", "*")
    result3 := strutil.Wrap("'foo'", "'")
    result4 := strutil.Wrap("", "*")

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

    // Output:
    // foo
    // *foo*
    // ''foo''
    //
}

Unwrap ​

Unwrap a given string from anther string. will change source string.

Signature:

go
func Unwrap(str string, wrapToken string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Unwrap("foo", "")
    result2 := strutil.Unwrap("*foo*", "*")
    result3 := strutil.Unwrap("*foo", "*")
    result4 := strutil.Unwrap("foo*", "*")
    result5 := strutil.Unwrap("**foo**", "*")

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

    // Output:
    // foo
    // foo
    // *foo
    // foo*
    // *foo*
}

SplitWords ​

Splits a string into words, word only contains alphabetic characters.

Signature:

go
func SplitWords(s string) []string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.SplitWords("a word")
    result2 := strutil.SplitWords("I'am a programmer")
    result3 := strutil.SplitWords("Bonjour, je suis programmeur")
    result4 := strutil.SplitWords("a -b-c' 'd'e")
    result5 := strutil.SplitWords("你好，我是一名码农")
    result6 := strutil.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)
    fmt.Println(result6)

    // Output:
    // [a word]
    // [I'am a programmer]
    // [Bonjour je suis programmeur]
    // [a b-c' d'e]
    // []
    // []
}

WordCount ​

Return the number of meaningful word, word only contains alphabetic characters.

Signature:

go
func WordCount(s string) int

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.WordCount("a word")
    result2 := strutil.WordCount("I'am a programmer")
    result3 := strutil.WordCount("Bonjour, je suis programmeur")
    result4 := strutil.WordCount("a -b-c' 'd'e")
    result5 := strutil.WordCount("你好，我是一名码农")
    result6 := strutil.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)
    fmt.Println(result6)

    // Output:
    // 2
    // 3
    // 4
    // 3
    // 0
    // 0
}

RemoveNonPrintable ​

Remove non-printable characters from a string.

Signature:

go
func RemoveNonPrintable(str string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.RemoveNonPrintable("hello\u00a0 \u200bworld\n")
    result2 := strutil.RemoveNonPrintable("你好😄")

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

    // Output:
    // hello world
    // 你好😄
}

StringToBytes ​

Converts a string to byte slice without a memory allocation.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    // [97 98 99]
    // true
}

BytesToString ​

Converts a byte slice to string without a memory allocation.

Signature:

go
func BytesToString(bytes []byte) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    bytes := []byte{'a', 'b', 'c'}
    result := strutil.BytesToString(bytes)

    fmt.Println(result)

    // Output:
    // abc
}

IsBlank ​

Checks if a string is whitespace or empty.

Signature:

go
func IsBlank(str string) bool

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.IsBlank("")
    result2 := strutil.IsBlank("\t\v\f\n")
    result3 := strutil.IsBlank(" 中文")

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

    // Output:
    // true
    // true
    // false
}

IsNotBlank ​

Checks if a string is not whitespace or not empty.

Signature:

go
func IsNotBlank(str string) bool

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.IsNotBlank("")
    result2 := strutil.IsNotBlank("    ")
    result3 := strutil.IsNotBlank("\t\v\f\n")
    result4 := strutil.IsNotBlank(" 中文")
    result5 := strutil.IsNotBlank("    world    ")
    
    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)
    fmt.Println(result5)
    // Output:
    // false
    // false
    // false
    // true
    // true
}

HasPrefixAny ​

Checks if a string starts with any of an array of specified strings.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    // true
    // false
}

HasSuffixAny ​

Checks if a string ends with any of an array of specified strings.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

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

    // Output:
    // true
    // false
}

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.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := "foo bar hello world"

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

ReplaceWithMap ​

Returns a copy of `str`, which is replaced by a map in unordered way, case-sensitively.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := "ac ab ab ac"
    replaces := map[string]string{
        "a": "1",
        "b": "2",
    }

    result := strutil.ReplaceWithMap(str, replaces)

    fmt.Println(result)
    // Output:
    // 1c 12 12 1c
}

Trim ​

Strips whitespace (or other characters) from the beginning and end of a string. The optional parameter `characterMask` specifies the additional stripped characters.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Trim("\nabcd")

    str := "$ ab    cd $ "

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

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

    // Output:
    // abcd
    // $ ab    cd $
    // ab    cd
}

SplitAndTrim ​

Splits string `str` by a string `delimiter` to a slice, and calls Trim to every element of slice. It ignores the elements which are empty after Trim.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := " a,b, c,d,$1 "

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

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

    // Output:
    // [a b c d $1]
    // [a b c d 1]
}

HideString ​

Hide some chars in source string with param `replaceChar`. replace range is origin[start : end]. [start, end).

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := "13242658976"

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

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

    // Output:
    // 13242658976
    // 132*2658976
    // 132****8976
    // 1324265****
}

ContainsAll ​

Return true if target string contains all the substrings.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := "hello world"

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

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

    // Output:
    // true
    // false
}

ContainsAny ​

Return true if target string contains any one of the substrings.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := "hello world"

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

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

    // Output:
    // true
    // true
    // false
}

RemoveWhiteSpace ​

Remove whitespace characters from a string. when set repalceAll is true removes all whitespace, false only replaces consecutive whitespace characters with one space.

Signature:

go
func RemoveWhiteSpace(str string, repalceAll bool) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := " hello   \r\n    \t   world"

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

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

    // Output:
    // helloworld
    // hello world
}

SubInBetween ​

Return substring between the start and end position(excluded) of source string.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    str := "abcde"

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

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

    // Output:
    // abc
    // bc
}

HammingDistance ​

HammingDistance calculates the Hamming distance between two strings. The Hamming distance is the number of positions at which the corresponding symbols are different.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {

    result1, _ := strutil.HammingDistance("de", "de")
    result2, _ := strutil.HammingDistance("a", "d")

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

    // Output:
    // 0
    // 1
}

Concat ​

Concatenates strings. length is the length of the concatenated string. If unsure, pass 0 or a negative number.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Concat(12, "Hello", " ", "World", "!")
    result2 := strutil.Concat(11, "Go", " ", "Language")
    result3 := strutil.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
}

Ellipsis ​

Truncates a string to a specified length and appends an ellipsis.

Signature:

go
func Ellipsis(str string, length int) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result1 := strutil.Ellipsis("hello world", 5)
    result2 := strutil.Ellipsis("你好，世界!", 2)
    result3 := strutil.Ellipsis("😀😃😄😁😆", 3)

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

    // Output:
    // hello...
    // 你好...
    // 😀😃😄...
}

Shuffle ​

Shuffle the order of characters of given string.

Signature:

go
func Shuffle(str string) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    result := strutil.Shuffle("hello")
    fmt.Println(result)  //olelh (random order)
}

Rotate ​

Rotates the string by the specified number of characters.

Signature:

go
func Rotate(str string, shift int) string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    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
}

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!".

Signature:

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

example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

    result := strutil.TemplateReplace(template, data)

    fmt.Println(result)

    // Output:
    // Hello, my name is Bob, I'm 20 years old.
}

RegexMatchAllGroups ​

Matches all subgroups in a string using a regular expression and returns the result.

Signature:

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

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

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

    result := strutil.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]
}

ExtractContent ​

Extracts the content between the start and end strings in the source string.

Signature:

go
func ExtractContent(s, start, end string) []string

Example:Run

go
import (
    "fmt"
    "github.com/duke-git/lancet/v2/strutil"
)

func main() {
    html := `<span>content1</span>aa<span>content2</span>bb<span>content1</span>`

    result := strutil.ExtractContent(html, "<span>", "</span>")

    fmt.Println(result)

    // Output:
    // [content1 content2 content1]
}