package strings

Import Path
	strings (on go.dev)

Dependency Relation
	imports 7 packages, and imported by 90 packages

Involved Source Files

	    builder.go
	    clone.go
	    compare.go
	    reader.go
	    replace.go
	    search.go
	  d strings.go
		Package strings implements simple functions to manipulate UTF-8 encoded strings.
		
		For information about UTF-8 strings in Go, see https://blog.golang.org/strings.
Code Examples

	Builder
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			var b strings.Builder
			for i := 3; i >= 1; i-- {
				fmt.Fprintf(&b, "%d...", i)
			}
			b.WriteString("ignition")
			fmt.Println(b.String())
		
		}

	Clone
		package main
		
		import (
			"fmt"
			"strings"
			"unsafe"
		)
		
		func main() {
			s := "abc"
			clone := strings.Clone(s)
			fmt.Println(s == clone)
			fmt.Println(unsafe.StringData(s) == unsafe.StringData(clone))
		}

	Compare
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.Compare("a", "b"))
			fmt.Println(strings.Compare("a", "a"))
			fmt.Println(strings.Compare("b", "a"))
		}

	Contains
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.Contains("seafood", "foo"))
			fmt.Println(strings.Contains("seafood", "bar"))
			fmt.Println(strings.Contains("seafood", ""))
			fmt.Println(strings.Contains("", ""))
		}

	ContainsAny
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.ContainsAny("team", "i"))
			fmt.Println(strings.ContainsAny("fail", "ui"))
			fmt.Println(strings.ContainsAny("ure", "ui"))
			fmt.Println(strings.ContainsAny("failure", "ui"))
			fmt.Println(strings.ContainsAny("foo", ""))
			fmt.Println(strings.ContainsAny("", ""))
		}

	ContainsFunc
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			f := func(r rune) bool {
				return r == 'a' || r == 'e' || r == 'i' || r == 'o' || r == 'u'
			}
			fmt.Println(strings.ContainsFunc("hello", f))
			fmt.Println(strings.ContainsFunc("rhythms", f))
		}

	ContainsRune
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			// Finds whether a string contains a particular Unicode code point.
			// The code point for the lowercase letter "a", for example, is 97.
			fmt.Println(strings.ContainsRune("aardvark", 97))
			fmt.Println(strings.ContainsRune("timeout", 97))
		}

	Count
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.Count("cheese", "e"))
			fmt.Println(strings.Count("five", "")) // before & after each rune
		}

	Cut
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			show := func(s, sep string) {
				before, after, found := strings.Cut(s, sep)
				fmt.Printf("Cut(%q, %q) = %q, %q, %v\n", s, sep, before, after, found)
			}
			show("Gopher", "Go")
			show("Gopher", "ph")
			show("Gopher", "er")
			show("Gopher", "Badger")
		}

	CutPrefix
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			show := func(s, sep string) {
				after, found := strings.CutPrefix(s, sep)
				fmt.Printf("CutPrefix(%q, %q) = %q, %v\n", s, sep, after, found)
			}
			show("Gopher", "Go")
			show("Gopher", "ph")
		}

	CutSuffix
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			show := func(s, sep string) {
				before, found := strings.CutSuffix(s, sep)
				fmt.Printf("CutSuffix(%q, %q) = %q, %v\n", s, sep, before, found)
			}
			show("Gopher", "Go")
			show("Gopher", "er")
		}

	EqualFold
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.EqualFold("Go", "go"))
			fmt.Println(strings.EqualFold("AB", "ab")) // true because comparison uses simple case-folding
			fmt.Println(strings.EqualFold("ß", "ss"))  // false because comparison does not use full case-folding
		}

	Fields
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Printf("Fields are: %q", strings.Fields("  foo bar  baz   "))
		}

	FieldsFunc
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			f := func(c rune) bool {
				return !unicode.IsLetter(c) && !unicode.IsNumber(c)
			}
			fmt.Printf("Fields are: %q", strings.FieldsFunc("  foo1;bar2,baz3...", f))
		}

	HasPrefix
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.HasPrefix("Gopher", "Go"))
			fmt.Println(strings.HasPrefix("Gopher", "C"))
			fmt.Println(strings.HasPrefix("Gopher", ""))
		}

	HasSuffix
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.HasSuffix("Amigo", "go"))
			fmt.Println(strings.HasSuffix("Amigo", "O"))
			fmt.Println(strings.HasSuffix("Amigo", "Ami"))
			fmt.Println(strings.HasSuffix("Amigo", ""))
		}

	Index
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.Index("chicken", "ken"))
			fmt.Println(strings.Index("chicken", "dmr"))
		}

	IndexAny
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.IndexAny("chicken", "aeiouy"))
			fmt.Println(strings.IndexAny("crwth", "aeiouy"))
		}

	IndexByte
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.IndexByte("golang", 'g'))
			fmt.Println(strings.IndexByte("gophers", 'h'))
			fmt.Println(strings.IndexByte("golang", 'x'))
		}

	IndexFunc
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			f := func(c rune) bool {
				return unicode.Is(unicode.Han, c)
			}
			fmt.Println(strings.IndexFunc("Hello, 世界", f))
			fmt.Println(strings.IndexFunc("Hello, world", f))
		}

	IndexRune
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.IndexRune("chicken", 'k'))
			fmt.Println(strings.IndexRune("chicken", 'd'))
		}

	Join
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			s := []string{"foo", "bar", "baz"}
			fmt.Println(strings.Join(s, ", "))
		}

	LastIndex
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.Index("go gopher", "go"))
			fmt.Println(strings.LastIndex("go gopher", "go"))
			fmt.Println(strings.LastIndex("go gopher", "rodent"))
		}

	LastIndexAny
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.LastIndexAny("go gopher", "go"))
			fmt.Println(strings.LastIndexAny("go gopher", "rodent"))
			fmt.Println(strings.LastIndexAny("go gopher", "fail"))
		}

	LastIndexByte
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.LastIndexByte("Hello, world", 'l'))
			fmt.Println(strings.LastIndexByte("Hello, world", 'o'))
			fmt.Println(strings.LastIndexByte("Hello, world", 'x'))
		}

	LastIndexFunc
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Println(strings.LastIndexFunc("go 123", unicode.IsNumber))
			fmt.Println(strings.LastIndexFunc("123 go", unicode.IsNumber))
			fmt.Println(strings.LastIndexFunc("go", unicode.IsNumber))
		}

	Map
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			rot13 := func(r rune) rune {
				switch {
				case r >= 'A' && r <= 'Z':
					return 'A' + (r-'A'+13)%26
				case r >= 'a' && r <= 'z':
					return 'a' + (r-'a'+13)%26
				}
				return r
			}
			fmt.Println(strings.Map(rot13, "'Twas brillig and the slithy gopher..."))
		}

	NewReplacer
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			r := strings.NewReplacer("<", "&lt;", ">", "&gt;")
			fmt.Println(r.Replace("This is <b>HTML</b>!"))
		}

	Repeat
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println("ba" + strings.Repeat("na", 2))
		}

	Replace
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.Replace("oink oink oink", "k", "ky", 2))
			fmt.Println(strings.Replace("oink oink oink", "oink", "moo", -1))
		}

	ReplaceAll
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.ReplaceAll("oink oink oink", "oink", "moo"))
		}

	Split
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Printf("%q\n", strings.Split("a,b,c", ","))
			fmt.Printf("%q\n", strings.Split("a man a plan a canal panama", "a "))
			fmt.Printf("%q\n", strings.Split(" xyz ", ""))
			fmt.Printf("%q\n", strings.Split("", "Bernardo O'Higgins"))
		}

	SplitAfter
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Printf("%q\n", strings.SplitAfter("a,b,c", ","))
		}

	SplitAfterN
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Printf("%q\n", strings.SplitAfterN("a,b,c", ",", 2))
		}

	SplitN
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Printf("%q\n", strings.SplitN("a,b,c", ",", 2))
			z := strings.SplitN("a,b,c", ",", 0)
			fmt.Printf("%q (nil = %v)\n", z, z == nil)
		}

	Title
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			// Compare this example to the ToTitle example.
			fmt.Println(strings.Title("her royal highness"))
			fmt.Println(strings.Title("loud noises"))
			fmt.Println(strings.Title("хлеб"))
		}

	ToLower
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.ToLower("Gopher"))
		}

	ToLowerSpecial
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Println(strings.ToLowerSpecial(unicode.TurkishCase, "Önnek İş"))
		}

	ToTitle
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			// Compare this example to the Title example.
			fmt.Println(strings.ToTitle("her royal highness"))
			fmt.Println(strings.ToTitle("loud noises"))
			fmt.Println(strings.ToTitle("хлеб"))
		}

	ToTitleSpecial
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Println(strings.ToTitleSpecial(unicode.TurkishCase, "dünyanın ilk borsa yapısı Aizonai kabul edilir"))
		}

	ToUpper
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.ToUpper("Gopher"))
		}

	ToUpperSpecial
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Println(strings.ToUpperSpecial(unicode.TurkishCase, "örnek iş"))
		}

	ToValidUTF8
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Printf("%s\n", strings.ToValidUTF8("abc", "\uFFFD"))
			fmt.Printf("%s\n", strings.ToValidUTF8("a\xffb\xC0\xAFc\xff", ""))
			fmt.Printf("%s\n", strings.ToValidUTF8("\xed\xa0\x80", "abc"))
		}

	Trim
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Print(strings.Trim("¡¡¡Hello, Gophers!!!", "!¡"))
		}

	TrimFunc
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Print(strings.TrimFunc("¡¡¡Hello, Gophers!!!", func(r rune) bool {
				return !unicode.IsLetter(r) && !unicode.IsNumber(r)
			}))
		}

	TrimLeft
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Print(strings.TrimLeft("¡¡¡Hello, Gophers!!!", "!¡"))
		}

	TrimLeftFunc
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Print(strings.TrimLeftFunc("¡¡¡Hello, Gophers!!!", func(r rune) bool {
				return !unicode.IsLetter(r) && !unicode.IsNumber(r)
			}))
		}

	TrimPrefix
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			var s = "¡¡¡Hello, Gophers!!!"
			s = strings.TrimPrefix(s, "¡¡¡Hello, ")
			s = strings.TrimPrefix(s, "¡¡¡Howdy, ")
			fmt.Print(s)
		}

	TrimRight
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Print(strings.TrimRight("¡¡¡Hello, Gophers!!!", "!¡"))
		}

	TrimRightFunc
		package main
		
		import (
			"fmt"
			"strings"
			"unicode"
		)
		
		func main() {
			fmt.Print(strings.TrimRightFunc("¡¡¡Hello, Gophers!!!", func(r rune) bool {
				return !unicode.IsLetter(r) && !unicode.IsNumber(r)
			}))
		}

	TrimSpace
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			fmt.Println(strings.TrimSpace(" \t\n Hello, Gophers \n\t\r\n"))
		}

	TrimSuffix
		package main
		
		import (
			"fmt"
			"strings"
		)
		
		func main() {
			var s = "¡¡¡Hello, Gophers!!!"
			s = strings.TrimSuffix(s, ", Gophers!!!")
			s = strings.TrimSuffix(s, ", Marmots!!!")
			fmt.Print(s)
		}


Package-Level Type Names (total 3)

	/* sort by: alphabet | popularity */
	 type Builder (struct)
		A Builder is used to efficiently build a string using [Builder.Write] methods.
		It minimizes memory copying. The zero value is ready to use.
		Do not copy a non-zero Builder.

		Methods (total 9)
			(*Builder) Cap() int
				Cap returns the capacity of the builder's underlying byte slice. It is the
				total space allocated for the string being built and includes any bytes
				already written.

			(*Builder) Grow(n int)
				Grow grows b's capacity, if necessary, to guarantee space for
				another n bytes. After Grow(n), at least n bytes can be written to b
				without another allocation. If n is negative, Grow panics.

			(*Builder) Len() int
				Len returns the number of accumulated bytes; b.Len() == len(b.String()).

			(*Builder) Reset()
				Reset resets the [Builder] to be empty.

			(*Builder) String() string
				String returns the accumulated string.

			(*Builder) Write(p []byte) (int, error)
				Write appends the contents of p to b's buffer.
				Write always returns len(p), nil.

			(*Builder) WriteByte(c byte) error
				WriteByte appends the byte c to b's buffer.
				The returned error is always nil.

			(*Builder) WriteRune(r rune) (int, error)
				WriteRune appends the UTF-8 encoding of Unicode code point r to b's buffer.
				It returns the length of r and a nil error.

			(*Builder) WriteString(s string) (int, error)
				WriteString appends the contents of s to b's buffer.
				It returns the length of s and a nil error.

		Implements (at least 6)
			*Builder : expvar.Var
			*Builder : fmt.Stringer
			*Builder : internal/bisect.Writer
			*Builder : io.ByteWriter
			*Builder : io.StringWriter
			*Builder : io.Writer

	 type Reader (struct)
		A Reader implements the [io.Reader], [io.ReaderAt], [io.ByteReader], [io.ByteScanner],
		[io.RuneReader], [io.RuneScanner], [io.Seeker], and [io.WriterTo] interfaces by reading
		from a string.
		The zero value for Reader operates like a Reader of an empty string.

		Methods (total 11)
			(*Reader) Len() int
				Len returns the number of bytes of the unread portion of the
				string.

			(*Reader) Read(b []byte) (n int, err error)
				Read implements the [io.Reader] interface.

			(*Reader) ReadAt(b []byte, off int64) (n int, err error)
				ReadAt implements the [io.ReaderAt] interface.

			(*Reader) ReadByte() (byte, error)
				ReadByte implements the [io.ByteReader] interface.

			(*Reader) ReadRune() (ch rune, size int, err error)
				ReadRune implements the [io.RuneReader] interface.

			(*Reader) Reset(s string)
				Reset resets the [Reader] to be reading from s.

			(*Reader) Seek(offset int64, whence int) (int64, error)
				Seek implements the [io.Seeker] interface.

			(*Reader) Size() int64
				Size returns the original length of the underlying string.
				Size is the number of bytes available for reading via [Reader.ReadAt].
				The returned value is always the same and is not affected by calls
				to any other method.

			(*Reader) UnreadByte() error
				UnreadByte implements the [io.ByteScanner] interface.

			(*Reader) UnreadRune() error
				UnreadRune implements the [io.RuneScanner] interface.

			(*Reader) WriteTo(w io.Writer) (n int64, err error)
				WriteTo implements the [io.WriterTo] interface.

		Implements (at least 11)
			*Reader : compress/flate.Reader
			*Reader : image/jpeg.Reader
			*Reader : io.ByteReader
			*Reader : io.ByteScanner
			*Reader : io.Reader
			*Reader : io.ReaderAt
			*Reader : io.ReadSeeker
			*Reader : io.RuneReader
			*Reader : io.RuneScanner
			*Reader : io.Seeker
			*Reader : io.WriterTo
		As Outputs Of (at least one exported)
			func NewReader(s string) *Reader

	 type Replacer (struct)
		Replacer replaces a list of strings with replacements.
		It is safe for concurrent use by multiple goroutines.

		Methods (total 2)
			(*Replacer) Replace(s string) string
				Replace returns a copy of s with all replacements performed.

			(*Replacer) WriteString(w io.Writer, s string) (n int, err error)
				WriteString writes s to w with all replacements performed.

		As Outputs Of (at least one exported)
			func NewReplacer(oldnew ...string) *Replacer


Package-Level Functions (total 52)

	 func Clone(s string) string
		Clone returns a fresh copy of s.
		It guarantees to make a copy of s into a new allocation,
		which can be important when retaining only a small substring
		of a much larger string. Using Clone can help such programs
		use less memory. Of course, since using Clone makes a copy,
		overuse of Clone can make programs use more memory.
		Clone should typically be used only rarely, and only when
		profiling indicates that it is needed.
		For strings of length zero the string "" will be returned
		and no allocation is made.

	 func Compare(a, b string) int
		Compare returns an integer comparing two strings lexicographically.
		The result will be 0 if a == b, -1 if a < b, and +1 if a > b.
		
		Compare is included only for symmetry with package bytes.
		It is usually clearer and always faster to use the built-in
		string comparison operators ==, <, >, and so on.

	 func Contains(s, substr string) bool
		Contains reports whether substr is within s.

	 func ContainsAny(s, chars string) bool
		ContainsAny reports whether any Unicode code points in chars are within s.

	 func ContainsFunc(s string, f func(rune) bool) bool
		ContainsFunc reports whether any Unicode code points r within s satisfy f(r).

	 func ContainsRune(s string, r rune) bool
		ContainsRune reports whether the Unicode code point r is within s.

	 func Count(s, substr string) int
		Count counts the number of non-overlapping instances of substr in s.
		If substr is an empty string, Count returns 1 + the number of Unicode code points in s.

	 func Cut(s, sep string) (before, after string, found bool)
		Cut slices s around the first instance of sep,
		returning the text before and after sep.
		The found result reports whether sep appears in s.
		If sep does not appear in s, cut returns s, "", false.

	 func CutPrefix(s, prefix string) (after string, found bool)
		CutPrefix returns s without the provided leading prefix string
		and reports whether it found the prefix.
		If s doesn't start with prefix, CutPrefix returns s, false.
		If prefix is the empty string, CutPrefix returns s, true.

	 func CutSuffix(s, suffix string) (before string, found bool)
		CutSuffix returns s without the provided ending suffix string
		and reports whether it found the suffix.
		If s doesn't end with suffix, CutSuffix returns s, false.
		If suffix is the empty string, CutSuffix returns s, true.

	 func EqualFold(s, t string) bool
		EqualFold reports whether s and t, interpreted as UTF-8 strings,
		are equal under simple Unicode case-folding, which is a more general
		form of case-insensitivity.

	 func Fields(s string) []string
		Fields splits the string s around each instance of one or more consecutive white space
		characters, as defined by unicode.IsSpace, returning a slice of substrings of s or an
		empty slice if s contains only white space.

	 func FieldsFunc(s string, f func(rune) bool) []string
		FieldsFunc splits the string s at each run of Unicode code points c satisfying f(c)
		and returns an array of slices of s. If all code points in s satisfy f(c) or the
		string is empty, an empty slice is returned.
		
		FieldsFunc makes no guarantees about the order in which it calls f(c)
		and assumes that f always returns the same value for a given c.

	 func HasPrefix(s, prefix string) bool
		HasPrefix reports whether the string s begins with prefix.

	 func HasSuffix(s, suffix string) bool
		HasSuffix reports whether the string s ends with suffix.

	 func Index(s, substr string) int
		Index returns the index of the first instance of substr in s, or -1 if substr is not present in s.

	 func IndexAny(s, chars string) int
		IndexAny returns the index of the first instance of any Unicode code point
		from chars in s, or -1 if no Unicode code point from chars is present in s.

	 func IndexByte(s string, c byte) int
		IndexByte returns the index of the first instance of c in s, or -1 if c is not present in s.

	 func IndexFunc(s string, f func(rune) bool) int
		IndexFunc returns the index into s of the first Unicode
		code point satisfying f(c), or -1 if none do.

	 func IndexRune(s string, r rune) int
		IndexRune returns the index of the first instance of the Unicode code point
		r, or -1 if rune is not present in s.
		If r is utf8.RuneError, it returns the first instance of any
		invalid UTF-8 byte sequence.

	 func Join(elems []string, sep string) string
		Join concatenates the elements of its first argument to create a single string. The separator
		string sep is placed between elements in the resulting string.

	 func LastIndex(s, substr string) int
		LastIndex returns the index of the last instance of substr in s, or -1 if substr is not present in s.

	 func LastIndexAny(s, chars string) int
		LastIndexAny returns the index of the last instance of any Unicode code
		point from chars in s, or -1 if no Unicode code point from chars is
		present in s.

	 func LastIndexByte(s string, c byte) int
		LastIndexByte returns the index of the last instance of c in s, or -1 if c is not present in s.

	 func LastIndexFunc(s string, f func(rune) bool) int
		LastIndexFunc returns the index into s of the last
		Unicode code point satisfying f(c), or -1 if none do.

	 func Map(mapping func(rune) rune, s string) string
		Map returns a copy of the string s with all its characters modified
		according to the mapping function. If mapping returns a negative value, the character is
		dropped from the string with no replacement.

	 func NewReader(s string) *Reader
		NewReader returns a new [Reader] reading from s.
		It is similar to [bytes.NewBufferString] but more efficient and non-writable.

	 func NewReplacer(oldnew ...string) *Replacer
		NewReplacer returns a new [Replacer] from a list of old, new string
		pairs. Replacements are performed in the order they appear in the
		target string, without overlapping matches. The old string
		comparisons are done in argument order.
		
		NewReplacer panics if given an odd number of arguments.

	 func Repeat(s string, count int) string
		Repeat returns a new string consisting of count copies of the string s.
		
		It panics if count is negative or if the result of (len(s) * count)
		overflows.

	 func Replace(s, old, new string, n int) string
		Replace returns a copy of the string s with the first n
		non-overlapping instances of old replaced by new.
		If old is empty, it matches at the beginning of the string
		and after each UTF-8 sequence, yielding up to k+1 replacements
		for a k-rune string.
		If n < 0, there is no limit on the number of replacements.

	 func ReplaceAll(s, old, new string) string
		ReplaceAll returns a copy of the string s with all
		non-overlapping instances of old replaced by new.
		If old is empty, it matches at the beginning of the string
		and after each UTF-8 sequence, yielding up to k+1 replacements
		for a k-rune string.

	 func Split(s, sep string) []string
		Split slices s into all substrings separated by sep and returns a slice of
		the substrings between those separators.
		
		If s does not contain sep and sep is not empty, Split returns a
		slice of length 1 whose only element is s.
		
		If sep is empty, Split splits after each UTF-8 sequence. If both s
		and sep are empty, Split returns an empty slice.
		
		It is equivalent to [SplitN] with a count of -1.
		
		To split around the first instance of a separator, see Cut.

	 func SplitAfter(s, sep string) []string
		SplitAfter slices s into all substrings after each instance of sep and
		returns a slice of those substrings.
		
		If s does not contain sep and sep is not empty, SplitAfter returns
		a slice of length 1 whose only element is s.
		
		If sep is empty, SplitAfter splits after each UTF-8 sequence. If
		both s and sep are empty, SplitAfter returns an empty slice.
		
		It is equivalent to [SplitAfterN] with a count of -1.

	 func SplitAfterN(s, sep string, n int) []string
		SplitAfterN slices s into substrings after each instance of sep and
		returns a slice of those substrings.
		
		The count determines the number of substrings to return:
		
			n > 0: at most n substrings; the last substring will be the unsplit remainder.
			n == 0: the result is nil (zero substrings)
			n < 0: all substrings
		
		Edge cases for s and sep (for example, empty strings) are handled
		as described in the documentation for SplitAfter.

	 func SplitN(s, sep string, n int) []string
		SplitN slices s into substrings separated by sep and returns a slice of
		the substrings between those separators.
		
		The count determines the number of substrings to return:
		
			n > 0: at most n substrings; the last substring will be the unsplit remainder.
			n == 0: the result is nil (zero substrings)
			n < 0: all substrings
		
		Edge cases for s and sep (for example, empty strings) are handled
		as described in the documentation for [Split].
		
		To split around the first instance of a separator, see Cut.

	 func Title(s string) string
		Title returns a copy of the string s with all Unicode letters that begin words
		mapped to their Unicode title case.
		
		Deprecated: The rule Title uses for word boundaries does not handle Unicode
		punctuation properly. Use golang.org/x/text/cases instead.

	 func ToLower(s string) string
		ToLower returns s with all Unicode letters mapped to their lower case.

	 func ToLowerSpecial(c unicode.SpecialCase, s string) string
		ToLowerSpecial returns a copy of the string s with all Unicode letters mapped to their
		lower case using the case mapping specified by c.

	 func ToTitle(s string) string
		ToTitle returns a copy of the string s with all Unicode letters mapped to
		their Unicode title case.

	 func ToTitleSpecial(c unicode.SpecialCase, s string) string
		ToTitleSpecial returns a copy of the string s with all Unicode letters mapped to their
		Unicode title case, giving priority to the special casing rules.

	 func ToUpper(s string) string
		ToUpper returns s with all Unicode letters mapped to their upper case.

	 func ToUpperSpecial(c unicode.SpecialCase, s string) string
		ToUpperSpecial returns a copy of the string s with all Unicode letters mapped to their
		upper case using the case mapping specified by c.

	 func ToValidUTF8(s, replacement string) string
		ToValidUTF8 returns a copy of the string s with each run of invalid UTF-8 byte sequences
		replaced by the replacement string, which may be empty.

	 func Trim(s, cutset string) string
		Trim returns a slice of the string s with all leading and
		trailing Unicode code points contained in cutset removed.

	 func TrimFunc(s string, f func(rune) bool) string
		TrimFunc returns a slice of the string s with all leading
		and trailing Unicode code points c satisfying f(c) removed.

	 func TrimLeft(s, cutset string) string
		TrimLeft returns a slice of the string s with all leading
		Unicode code points contained in cutset removed.
		
		To remove a prefix, use [TrimPrefix] instead.

	 func TrimLeftFunc(s string, f func(rune) bool) string
		TrimLeftFunc returns a slice of the string s with all leading
		Unicode code points c satisfying f(c) removed.

	 func TrimPrefix(s, prefix string) string
		TrimPrefix returns s without the provided leading prefix string.
		If s doesn't start with prefix, s is returned unchanged.

	 func TrimRight(s, cutset string) string
		TrimRight returns a slice of the string s, with all trailing
		Unicode code points contained in cutset removed.
		
		To remove a suffix, use [TrimSuffix] instead.

	 func TrimRightFunc(s string, f func(rune) bool) string
		TrimRightFunc returns a slice of the string s with all trailing
		Unicode code points c satisfying f(c) removed.

	 func TrimSpace(s string) string
		TrimSpace returns a slice of the string s, with all leading
		and trailing white space removed, as defined by Unicode.

	 func TrimSuffix(s, suffix string) string
		TrimSuffix returns s without the provided trailing suffix string.
		If s doesn't end with suffix, s is returned unchanged.

The pages are generated with Golds v0.6.9-preview. (GOOS=linux GOARCH=amd64)
Golds is a Go 101 project developed by Tapir Liu.
PR and bug reports are welcome and can be submitted to the issue list.
Please follow @Go100and1 (reachable from the left QR code) to get the latest news of Golds.