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.
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func Contains(s, substr string) bool
Contains reports whether substr is within s.
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func ContainsAny(s, chars string) bool
ContainsAny reports whether any Unicode code points in chars are within s.
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func ContainsRune(s string, r rune) bool
ContainsRune reports whether the Unicode code point r is within s.
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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.
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func EqualFold(s, t string) bool
EqualFold reports whether s and t, interpreted as UTF-8 strings, are equal under Unicode case-folding.
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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.
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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.
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func HasPrefix(s, prefix string) bool
HasPrefix tests whether the string s begins with prefix.
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func HasSuffix(s, suffix string) bool
HasSuffix tests whether the string s ends with suffix.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
▹ Example
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.
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func ToLower(s string) string
ToLower returns a copy of the string s with all Unicode letters mapped to their lower case.
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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, giving priority to the special casing rules.
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func ToTitle(s string) string
ToTitle returns a copy of the string s with all Unicode letters mapped to their title case.
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func ToTitleSpecial(c 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.
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func ToUpper(s string) string
ToUpper returns a copy of the string s with all Unicode letters mapped to their upper case.
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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, giving priority to the special casing rules.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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A Builder is used to efficiently build a string using Write methods. It minimizes memory copying. The zero value is ready to use. Do not copy a non-zero Builder.
type Builder struct {
// contains filtered or unexported fields
}
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func (b *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.
func (b *Builder) Len() int
Len returns the number of accumulated bytes; b.Len() == len(b.String()).
func (b *Builder) Reset()
Reset resets the Builder to be empty.
func (b *Builder) String() string
String returns the accumulated string.
func (b *Builder) Write(p []byte) (int, error)
Write appends the contents of p to b's buffer. Write always returns len(p), nil.
func (b *Builder) WriteByte(c byte) error
WriteByte appends the byte c to b's buffer. The returned error is always nil.
func (b *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.
func (b *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.
A Reader implements the io.Reader, io.ReaderAt, io.Seeker, io.WriterTo, io.ByteScanner, and io.RuneScanner interfaces by reading from a string.
type Reader struct {
// contains filtered or unexported fields
}
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.
Replacer replaces a list of strings with replacements. It is safe for concurrent use by multiple goroutines.
type Replacer struct {
// contains filtered or unexported fields
}
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.
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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.
The rule Title uses for word boundaries does not handle Unicode punctuation properly.