The strings library

Overview

The strings library supplies functions for handling the built-in string type.

Functions

compare(a string, b string) -> int

compare(a, b) returns an integer comparing two strings lexicographically. The result is 0 if a == b, -1 if a < b, and +1 if a > b.

contains(s string, substr string) -> bool

contains(s, substr) reports whether substr is contained within s.

containsAny(s string, chars string) -> bool

containsAny(s, chars) reports whether any Unicode code points in chars are within s.

count(s string, substr string) -> int

count(s, substr) counts the number of non-overlapping instances of substr in s.

cut(s string, sep string) -> string, string, bool

cut(s, sep) slices s around the first instance of sep, returning the text before and after sep.

equalFold(s string, t string) -> bool

equalFold(s, t) reports whether s and t, interpreted as UTF-8 strings, are equal under simple Unicode case-folding.

fields(s string)

fields(s) splits s around one or more consecutive white-space characters.

hasPrefix(s string, prefix string) -> bool

hasPrefix(s, prefix) reports whether s begins with prefix.

hasSuffix(s string, suffix string) -> bool

hasSuffix(s, suffix) reports whether s ends with suffix.

index(s string, substr string) -> int

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

indexAny(s string, chars string) -> int

indexAny(s, chars) returns the index of the first instance in s of any Unicode code point from chars, or -1 if none is present.

join(elems list, sep string) -> string / error

join(elems, sep) concatenates the elements of elems to create a single string separated by sep. It returns an error if elems contains a non-string value.

lastIndex(s string, substr string) -> int

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

lastIndexAny(s string, chars string) -> int

lastIndexAny(s, chars) returns the index of the last instance in s of any Unicode code point from chars, or -1 if none is present.

repeat(s string, c int) -> string

repeat(s, c) returns a new string consisting of c copies of s.

replace(s string, old string, new string, n int) -> string

replace(s, old, new, n) returns a copy of s with the first n non-overlapping instances of old replaced by new.

replaceAll(s string, old string, new string) -> string

replaceAll(s, old, new) returns a copy of s with all non-overlapping instances of old replaced by new.

split(s string, sep string)

split(s, sep) slices s into all substrings separated by sep.

splitAfter(s string, sep string)

splitAfter(s, sep) slices s into all substrings after each instance of sep and includes sep in the returned substrings.

splitAfterN(s string, sep string, n int)

splitAfterN(s, sep, n) slices s into substrings after each instance of sep and includes sep in the substrings returned.

splitN(s string, sep string, n int)

splitN(s, sep, n) slices s into substrings separated by sep.

toLower(s string) -> string

toLower(s) returns a copy of s with all Unicode letters mapped to their lower case.

toTitle(s string) -> string

toTitle(s) returns a copy of s with all Unicode letters mapped to their title case.

toUpper(s string) -> string

toUpper(s) returns a copy of s with all Unicode letters mapped to their upper case.

toValidUTF_8(s string, replacementString string) -> string

toValidUTF_8(s, replacementString) returns a copy of s with each run of invalid UTF-8 byte sequences replaced by replacementString.

trim(s string, cutset string) -> string

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

trimLeft(s string, cutset string) -> string

trimLeft(s, cutset) returns a slice of s with all leading Unicode code points contained in cutset removed.

trimPrefix(s string, prefix string) -> string

trimPrefix(s, prefix) returns s without the provided leading prefix. If s does not start with prefix, s is returned unchanged.

trimRight(s string, cutset string) -> string

trimRight(s, cutset) returns a slice of s with all trailing Unicode code points contained in cutset removed.

trimSuffix(s string, prefix string) -> string

trimSuffix(s, suffix) returns s without the provided trailing suffix. If s does not end with the suffix, s is returned unchanged.

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