Documentation
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Overview ¶
Package strings implements simple functions to manipulate UTF-8 encoded strings.package strings.
Some of the functions in this package are specifically intended as field constraints. For instance, MaxRunes as used in this CUE program
import "strings" myString: strings.MaxRunes(5)
specifies that the myString should be at most 5 code points.
Index ¶
- func ByteAt(b []byte, i int) (byte, error)
- func ByteSlice(b []byte, start, end int) ([]byte, error)
- func Compare(a, b string) int
- func Contains(s, substr string) bool
- func ContainsAny(s, chars string) bool
- func Count(s, substr string) int
- func Fields(s string) []string
- func HasPrefix(s, prefix string) bool
- func HasSuffix(s, suffix string) bool
- func Index(s, substr string) int
- func IndexAny(s, chars string) int
- func Join(elems []string, sep string) string
- func LastIndex(s, substr string) int
- func LastIndexAny(s, chars string) int
- func MaxRunes(s string, max int) bool
- func MinRunes(s string, min int) bool
- func Repeat(s string, count int) string
- func Replace(s, old, new string, n int) string
- func Runes(s string) []rune
- func SliceRunes(s string, start, end int) (string, error)
- 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 ToCamel(s string) string
- func ToLower(s string) string
- func ToTitle(s string) string
- func ToUpper(s string) string
- func Trim(s, cutset string) string
- func TrimLeft(s, cutset string) string
- func TrimPrefix(s, prefix string) string
- func TrimRight(s, cutset string) string
- func TrimSpace(s string) string
- func TrimSuffix(s, suffix string) string
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func ByteSlice ¶
ByteSlice reports the bytes of the underlying string data from the start index up to but not including the end index.
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 ContainsAny ¶
ContainsAny reports whether any Unicode code points in chars are within s.
func Count ¶
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 Fields ¶
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 Index ¶
Index returns the index of the first instance of substr in s, or -1 if substr 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 Join ¶
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 ¶
LastIndex returns the index of the last instance of substr in s, or -1 if substr 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 MaxRunes ¶
MaxRunes reports whether the number of runes (Unicode codepoints) in a string exceeds a certain maximum. MaxRunes can be used a field constraint to except all strings for which this property holds
func MinRunes ¶
MinRunes reports whether the number of runes (Unicode codepoints) in a string is at least a certain minimum. MinRunes can be used a field constraint to except all strings for which this property holds.
func Repeat ¶
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 ¶
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 SliceRunes ¶
SliceRunes returns a string of the underlying string data from the start index up to but not including the end index.
func Split ¶
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.
func SplitAfter ¶
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 ¶
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 ¶
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.
func ToCamel ¶
ToCamel returns a copy of the string s with all Unicode letters that begin words mapped to lower case.
func ToTitle ¶
ToTitle returns a copy of the string s with all Unicode letters that begin words mapped to their title case.
func Trim ¶
Trim returns a slice of the string s with all leading and trailing Unicode code points contained in cutset removed.
func TrimLeft ¶
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 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.
To remove a suffix, use TrimSuffix instead.
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 ¶
This section is empty.
Source Files