示例的函数列表
- Contains: search for a smaller string in a bigger string.
- Count: count the number of times a smaller string occurs in a bigger string.
- HasPrefix: determine if a bigger string starts with a smaller string.
- HasSuffix: determine if a bigger string ends with a smaller string.
- Index: find the position of a smaller string in a bigger string.
- Join: take a list of strings and join them together in a single string separated by another string.
- Repeat: repeat a string.
- Replace: replace a smaller string in a bigger string with some other string. Replace also takes a number indicating how many - times to do the replacement (pass -1 to do it as many times as possible).
- Split: split a string into a list of strings by a separating string.
- ToLower: convert a string to all lowercase letters.
- ToUpper: convert a string to all uppercase letters.
代码
package main
import "fmt"
import "strings" // Not 'string'
func main() {
test_strings()
}
func test_strings() {
fmt.Println(strings.Contains("test", "es")) // true
fmt.Println(strings.Contains("test", "esx")) // false
fmt.Println(strings.Count("test", "es")) // 1
fmt.Println(strings.Count("test", "t")) // 2
fmt.Println(strings.Count("test", "xes")) // 0
fmt.Println(strings.HasPrefix("test", "tes")) // true
fmt.Println(strings.HasPrefix("test", "xes")) // false
fmt.Println(strings.HasSuffix("test", "est")) // true
fmt.Println(strings.HasSuffix("test", "xes")) // false
fmt.Println(strings.HasSuffix("test", "")) // ture. //Ooh, who will write this code?!
fmt.Println(strings.Index("test", "est")) // 1
fmt.Println(strings.Index("test", "xes")) // -1
fmt.Println(strings.Join([]string{"a", "b"}, "-")) //"a-b"
fmt.Println(strings.Join([]string{"a", "b"}, "")) // "ab"
fmt.Println(strings.Repeat("abc", 3)) // "abcabcabc"
fmt.Println(strings.Replace("aaaa", "a", "b", 0)) // "aaaa"
fmt.Println(strings.Replace("aaaa", "a", "b", 2)) // "bbaa"
fmt.Println(strings.Replace("aaaa", "a", "b", -1)) // "bbbb"
fmt.Println(strings.Replace("aaaa", "a", "b", -2)) // "bbbb". It does workds, but do not use it.
fmt.Println(strings.Split("a-b-c-d", "-")) // [a b c d]
fmt.Println(strings.ToLower("TEST")) // "test"
fmt.Println(strings.ToUpper("test")) // "TEST"
// convert a string to a slice of bytes (and vice versa).
fmt.Println([]byte("test")) //[116 101 115 116]
fmt.Println(string([]byte{'t', 'e', 's', 't'})) // "test"
}
godoc cmd/strings
PACKAGE DOCUMENTATION
package strings
import "."
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.
FUNCTIONS
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 ContainsRune(s string, r rune) bool
ContainsRune reports whether the Unicode code point r is within s.
func Count(s, sep string) int
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(s, t string) bool
EqualFold reports whether s and t, interpreted as UTF-8 strings, are
equal under Unicode case-folding.
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 an array of substrings of s or an empty list 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).
If f does not return consistent results for a given c, FieldsFunc may
crash.
func HasPrefix(s, prefix string) bool
HasPrefix tests whether the string s begins with prefix.
func HasSuffix(s, suffix string) bool
HasSuffix tests whether the string s ends with suffix.
func Index(s, sep string) int
Index returns the index of the first instance of sep in s, or -1 if sep
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.
func Join(a []string, sep string) string
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(s, sep string) int
LastIndex returns the index of the last instance of sep in s, or -1 if
sep 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 Repeat(s string, count int) string
Repeat returns a new string consisting of count copies of the string s.
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 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 sep is empty, Split
splits after each UTF-8 sequence. It is equivalent to SplitN with a
count of -1.
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 sep is empty, SplitAfter splits
after each UTF-8 sequence. 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. 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
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. 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
func Title(s string) string
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(s string) string
ToLower returns a copy of the string s with all Unicode letters mapped
to their lower case.
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(s string) string
ToTitle returns a copy of the string s with all Unicode letters mapped
to their title case.
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(s string) string
ToUpper returns a copy of the string s with all Unicode letters mapped
to their upper case.
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(s string, 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 string, cutset string) string
TrimLeft returns a slice of the string s with all leading Unicode code
points contained in cutset removed.
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 string, cutset string) string
TrimRight returns a slice of the string s, with all trailing Unicode
code points contained in cutset removed.
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.
TYPES
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(s string) *Reader
NewReader returns a new Reader reading from s. It is similar to
bytes.NewBufferString but more efficient and read-only.
func (r *Reader) Len() int
Len returns the number of bytes of the unread portion of the string.
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)
Reset resets the Reader to be reading from s.
func (r *Reader) Seek(offset int64, whence int) (int64, error)
Seek implements the io.Seeker interface.
func (r *Reader) Size() int64
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 (r *Reader) UnreadByte() error
func (r *Reader) UnreadRune() error
func (r *Reader) WriteTo(w io.Writer) (n int64, err error)
WriteTo implements the io.WriterTo interface.
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(oldnew ...string) *Replacer
NewReplacer returns a new Replacer from a list of old, new string pairs.
Replacements are performed in order, without overlapping matches.
func (r *Replacer) Replace(s string) string
Replace returns a copy of s with all replacements performed.
func (r *Replacer) WriteString(w io.Writer, s string) (n int, err error)
WriteString writes s to w with all replacements performed.
BUGS
The rule Title uses for word boundaries does not handle Unicode
punctuation properly.
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