package strings
import "strings"
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.
Index ¶
- func Compare(a, b string) int
- func Contains(s, substr string) bool
- func ContainsAny(s, chars string) bool
- func ContainsRune(s string, r rune) bool
- func Count(s, sep string) int
- func EqualFold(s, t string) bool
- func Fields(s string) []string
- func FieldsFunc(s string, f func(rune) bool) []string
- func HasPrefix(s, prefix string) bool
- func HasSuffix(s, suffix string) bool
- func Index(s, sep string) int
- func IndexAny(s, chars string) int
- func IndexByte(s string, c byte) int
- func IndexFunc(s string, f func(rune) bool) int
- func IndexRune(s string, r rune) int
- func Join(a []string, sep string) string
- func LastIndex(s, sep string) int
- func LastIndexAny(s, chars string) int
- func LastIndexByte(s string, c byte) int
- func LastIndexFunc(s string, f func(rune) bool) int
- func Map(mapping func(rune) rune, s string) string
- func Repeat(s string, count int) string
- func Replace(s, old, new string, n int) string
- func Split(s, sep string) []string
- func SplitAfter(s, sep string) []string
- func SplitAfterN(s, sep string, n int) []string
- func SplitN(s, sep string, n int) []string
- func Title(s string) string
- func ToLower(s string) string
- func ToLowerSpecial(_case unicode.SpecialCase, s string) string
- func ToTitle(s string) string
- func ToTitleSpecial(_case unicode.SpecialCase, s string) string
- func ToUpper(s string) string
- func ToUpperSpecial(_case unicode.SpecialCase, s string) string
- func Trim(s string, cutset string) string
- func TrimFunc(s string, f func(rune) bool) string
- func TrimLeft(s string, cutset string) string
- func TrimLeftFunc(s string, f func(rune) bool) string
- func TrimPrefix(s, prefix string) string
- func TrimRight(s string, cutset string) string
- func TrimRightFunc(s string, f func(rune) bool) string
- func TrimSpace(s string) string
- func TrimSuffix(s, suffix string) string
- type Reader
- func NewReader(s string) *Reader
- func (r *Reader) Len() int
- func (r *Reader) Read(b []byte) (n int, err error)
- func (r *Reader) ReadAt(b []byte, off int64) (n int, err error)
- func (r *Reader) ReadByte() (byte, error)
- func (r *Reader) ReadRune() (ch rune, size int, err error)
- func (r *Reader) Reset(s string)
- func (r *Reader) Seek(offset int64, whence int) (int64, error)
- func (r *Reader) Size() int64
- func (r *Reader) UnreadByte() error
- func (r *Reader) UnreadRune() error
- func (r *Reader) WriteTo(w io.Writer) (n int64, err error)
- type Replacer
- func NewReplacer(oldnew ...string) *Replacer
- func (r *Replacer) Replace(s string) string
- func (r *Replacer) WriteString(w io.Writer, s string) (n int, err error)
- Bugs
Examples ¶
- Contains
- ContainsAny
- Count
- EqualFold
- Fields
- FieldsFunc
- HasPrefix
- HasSuffix
- Index
- IndexAny
- IndexFunc
- IndexRune
- Join
- LastIndex
- Map
- NewReplacer
- Repeat
- Replace
- Split
- SplitAfter
- SplitAfterN
- SplitN
- Title
- ToLower
- ToTitle
- ToUpper
- Trim
- TrimPrefix
- TrimSpace
- TrimSuffix
Functions ¶
func Compare ¶
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 ¶
Contains reports whether substr is within s.
func ContainsAny ¶
ContainsAny reports whether any Unicode code points in chars are within s.
func ContainsRune ¶
ContainsRune reports whether the Unicode code point r is within s.
func Count ¶
Count counts the number of non-overlapping instances of sep in s. If sep is an empty string, Count returns 1 + the number of Unicode code points in s.
func EqualFold ¶
EqualFold reports whether s and t, interpreted as UTF-8 strings, are equal under Unicode case-folding.
func Fields ¶
Fields splits the string s around each instance of one or more consecutive white space characters, as defined by unicode.IsSpace, returning an array of substrings of s or an empty list if s contains only white space.
func FieldsFunc ¶
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). If f does not return consistent results for a given c, FieldsFunc may crash.
func HasPrefix ¶
HasPrefix tests whether the string s begins with prefix.
func HasSuffix ¶
HasSuffix tests whether the string s ends with suffix.
func Index ¶
Index returns the index of the first instance of sep in s, or -1 if sep is not present in s.
func IndexAny ¶
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 ¶
IndexByte returns the index of the first instance of c in s, or -1 if c is not present in s.
func IndexFunc ¶
IndexFunc returns the index into s of the first Unicode code point satisfying f(c), or -1 if none do.
func IndexRune ¶
IndexRune returns the index of the first instance of the Unicode code point r, or -1 if rune is not present in s.
func Join ¶
Join concatenates the elements of a to create a single string. The separator string sep is placed between elements in the resulting string.
func LastIndex ¶
LastIndex returns the index of the last instance of sep in s, or -1 if sep is not present in s.
func LastIndexAny ¶
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 ¶
LastIndexByte returns the index of the last instance of c in s, or -1 if c is not present in s.
func LastIndexFunc ¶
LastIndexFunc returns the index into s of the last Unicode code point satisfying f(c), or -1 if none do.
func Map ¶
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.
Code:play
Output:Example¶
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..."))
}
'Gjnf oevyyvt naq gur fyvgul tbcure...
func Repeat ¶
Repeat returns a new string consisting of count copies of the string s.
func Replace ¶
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 Split ¶
Split slices s into all substrings separated by sep and returns a slice of
the substrings between those separators.
If sep is empty, Split splits after each UTF-8 sequence.
It is equivalent to SplitN with a count of -1.
Code:play
Output:Example¶
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"))
}
["a" "b" "c"]
["" "man " "plan " "canal panama"]
[" " "x" "y" "z" " "]
[""]
func SplitAfter ¶
SplitAfter slices s into all substrings after each instance of sep and returns a slice of those substrings. If sep is empty, SplitAfter splits after each UTF-8 sequence. It is equivalent to SplitAfterN with a count of -1.
func SplitAfterN ¶
SplitAfterN slices s into substrings after each instance of sep and returns a slice of those substrings. If sep is empty, SplitAfterN splits after each UTF-8 sequence. 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
Example¶
Code:play
package main import ( "fmt" "strings" ) func main() { fmt.Printf("%q\n", strings.SplitAfterN("a,b,c", ",", 2)) }
Output:
["a," "b,c"]
func SplitN ¶
SplitN slices s into substrings separated by sep and returns a slice of the substrings between those separators. If sep is empty, SplitN splits after each UTF-8 sequence. 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
Example¶
Code:play
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) }
Output:
["a" "b,c"] [] (nil = true)
func Title ¶
Title returns a copy of the string s with all Unicode letters that begin words mapped to their title case.
BUG(rsc): The rule Title uses for word boundaries does not handle Unicode punctuation properly.
func ToLower ¶
ToLower returns a copy of the string s with all Unicode letters mapped to their lower case.
func ToLowerSpecial ¶
func ToLowerSpecial(_case unicode.SpecialCase, s string) string
ToLowerSpecial returns a copy of the string s with all Unicode letters mapped to their lower case, giving priority to the special casing rules.
func ToTitle ¶
ToTitle returns a copy of the string s with all Unicode letters mapped to their title case.
func ToTitleSpecial ¶
func ToTitleSpecial(_case unicode.SpecialCase, s string) string
ToTitleSpecial returns a copy of the string s with all Unicode letters mapped to their title case, giving priority to the special casing rules.
func ToUpper ¶
ToUpper returns a copy of the string s with all Unicode letters mapped to their upper case.
func ToUpperSpecial ¶
func ToUpperSpecial(_case unicode.SpecialCase, s string) string
ToUpperSpecial returns a copy of the string s with all Unicode letters mapped to their upper case, giving priority to the special casing rules.
func Trim ¶
Trim returns a slice of the string s with all leading and trailing Unicode code points contained in cutset removed.
func TrimFunc ¶
TrimFunc returns a slice of the string s with all leading and trailing Unicode code points c satisfying f(c) removed.
func TrimLeft ¶
TrimLeft returns a slice of the string s with all leading Unicode code points contained in cutset removed.
func TrimLeftFunc ¶
TrimLeftFunc returns a slice of the string s with all leading Unicode code points c satisfying f(c) removed.
func TrimPrefix ¶
TrimPrefix returns s without the provided leading prefix string. If s doesn't start with prefix, s is returned unchanged.
func TrimRight ¶
TrimRight returns a slice of the string s, with all trailing Unicode code points contained in cutset removed.
func TrimRightFunc ¶
TrimRightFunc returns a slice of the string s with all trailing Unicode code points c satisfying f(c) removed.
func TrimSpace ¶
TrimSpace returns a slice of the string s, with all leading and trailing white space removed, as defined by Unicode.
func TrimSuffix ¶
TrimSuffix returns s without the provided trailing suffix string. If s doesn't end with suffix, s is returned unchanged.
Types ¶
type Reader ¶
type Reader struct {
// contains filtered or unexported fields
}
A Reader implements the io.Reader, io.ReaderAt, io.Seeker, io.WriterTo, io.ByteScanner, and io.RuneScanner interfaces by reading from a string.
func NewReader ¶
NewReader returns a new Reader reading from s. It is similar to bytes.NewBufferString but more efficient and read-only.
func (*Reader) Len ¶
Len returns the number of bytes of the unread portion of the string.
func (*Reader) Read ¶
func (*Reader) ReadAt ¶
func (*Reader) ReadByte ¶
func (*Reader) ReadRune ¶
func (*Reader) Reset ¶
Reset resets the Reader to be reading from s.
func (*Reader) Seek ¶
Seek implements the io.Seeker interface.
func (*Reader) Size ¶
Size returns the original length of the underlying string. Size is the number of bytes available for reading via ReadAt. The returned value is always the same and is not affected by calls to any other method.
func (*Reader) UnreadByte ¶
func (*Reader) UnreadRune ¶
func (*Reader) WriteTo ¶
WriteTo implements the io.WriterTo interface.
type Replacer ¶
type Replacer struct {
// contains filtered or unexported fields
}
Replacer replaces a list of strings with replacements. It is safe for concurrent use by multiple goroutines.
func NewReplacer ¶
NewReplacer returns a new Replacer from a list of old, new string pairs. Replacements are performed in order, without overlapping matches.
func (*Replacer) Replace ¶
Replace returns a copy of s with all replacements performed.
func (*Replacer) WriteString ¶
WriteString writes s to w with all replacements performed.
Bugs ¶
☞ The rule Title uses for word boundaries does not handle Unicode punctuation properly.
Source Files ¶
compare.go reader.go replace.go search.go strings.go strings_amd64.go strings_decl.go
- Version
- v1.7.1
- Published
- Sep 7, 2016
- Platform
- windows/amd64
- Imports
- 4 packages
- Last checked
- 24 seconds ago –
Tools for package owners.