`string` module

The string module contains several useful functions for string manipulation, as well as some variables containing groups of similar characters.

Variable	Contents
`DIGITS`	`"0123456789"`
`HEXDIGITS`	`"0123456789abcdef"`
`LETTERS`	`UPPERCASE + LOWERCASE`
`LOWERCASE`	`"abcdefghijklmnopqrstuvwxyz"`
`OCTDIGITS`	`"01234567"`
`PRINTABLE`	`LETTERS + DIGITS + PUNCTUATION + WHITESPACE`
`PUNCTUATION`	"!\"#$%&'()*+,-./:;<=>?@[]^_`{\\|}~"
`UPPERCASE`	`"ABCDEFGHIJKLMNOPQRSTUVWXYZ"`
`WHITESPACE`	`" \t\n\r\f\v"`

Function	Use
`capitalize(string)`	Returns a copy of `string` with the first character set to uppercase (assuming it's a cased character²) and all subsequent character set to lowercase.
`center(string, length[, char])`¹	Returns `string` centered in a new string of length `length`, padded using the specified `char`. If `char` is not specified, it defaults to `" "` (space). `string` is returned unchanged if `length` is less than or equal to the length of `string`.
`ends_with(string, suffix)`	Returns `1` if `string` ends with the substring `suffix`, otherwise returns `0`.
`is_alphabetic(string)`	Returns `1` if every character in `string` is an alphabetic character, i.e. is contained in the string `letters`, otherwise returns `0`.
`is_alphanumeric(string)`	Returns `1` if every character in `string` is an alphanumeric character, i.e. is contained in the strings `letters` or `numbers`, otherwise returns `0`.
`is_capitalized(string)`	Returns `1` if `string` is capitalized, i.e. matches the output of `capitalize(string)` exactly.
`is_decimal(string)`	Returns `1` if every character in `string` is a decimal digit, i.e. is contained in the string `DIGITS`, otherwise returns `0`.
`is_hexadecimal(string)`	Returns `1` if every character in `string` is a hexadecimal digit, i.e. is contained in the string `HEXDIGITS`, otherwise returns `0`.
`is_in_group(string, group)`	Returns `1` if every character in `string` is in the specified `group` of type Array or String, otherwise returns `0`.
`is_lower(string)`	Returns `1` if every cased character² in `string` is lowercase, otherwise returns `0`.
`is_octal(string)`	Returns `1` if every character in `string` is an octal digit, i.e. is contained in the string `OCTDIGITS`, otherwise returns `0`.
`is_title(string)`	Returns `1` if `string` is in title case, i.e. matches the output of `title(string)` exactly.
`is_upper(string)`	Returns `1` if every cased character² in `string` is uppercase, otherwise returns `0`.
`is_wrapped(string, chars)`	Returns `1` if `string` both starts and ends with the substring `chars`, otherwise returns `0`.
`join(iterable[, delimiter])`	Returns a string with each consecutive member of `iterable` converted to a string and joined with `delimiter` between them. If `delimiter` is not specified, it defaults to `" "`.
`leftpad(string, length[, char])`	Returns a copy of `string` padded on the left so that it's `length` characters long, using `char` for padding. If `char` is not specified, it defaults to `" "`. If `length` is shorter than `string`'s length, a copy of `string` is returned.
`ordinal(n)`	Returns an ordinal numeral of a number, e.g. `ordinal(/)` returns `"1st"`.
`replace(string, replacement[, count])`	Returns a copy of `string`, with all instances of each key in the `replacement` table replaced with its corresponding value. If `count` is specified, only the first `count` instances of each key will be replaced, starting from the left.
`rightpad(string, length[, char])`	Returns a copy of `string` padded on the right so that it's `length` characters long, using `char` for padding. If `char` is not specified, it defaults to `" "`. If `length` is shorter than `string`'s length, a copy of `string` is returned.
`split(string[, separator])`	Returns an array of the words in `string`, separated by `separator`. If `separator` is not specified, it defaults to `" "`. If `separator` is an Array, all of its elements will be used as separators.
`split_lines(string)`	Returns an array of the lines in the string, breaking at line boundaries. Line breaks are not included in the resulting array.
`starts_with(string, prefix)`	Returns `1` if `string` starts with the substring `prefix`, otherwise returns `0`.
`strip(string, chars)`	Returns a copy of `string` with `chars` removed from both the beginning and the end, as in `strip_left` and `strip_right`.
`strip_left(string, prefix)`	Returns a copy of `string` with `prefix` removed from the beginning, multiple times if `string` still begins with `prefix`. If `string` doesn't begin with `prefix`, a copy of the original `string` is returned.
`strip_right(string, suffix)`	Returns a copy of `string` with `suffix` removed from the end, multiple times if `string` still ends with `suffix`. If `string` doesn't end with `suffix`, a copy of the original `string` is returned.
`swapcase(string)`	Returns a copy of `string` with every cased character² set to the opposite of its original case.
`title(string)`	Returns a copy of `string` with the first character of each word (separated by spaces) set to uppercase (assuming they're cased characters²), and all subsequent characters of each word set to lowercase.
`to_lower(string)`	Returns a copy of `string` with every cased character² set to lowercase.
`to_upper(string)`	Returns a copy of `string` with every cased character² set to uppercase.
`wrap(string, wrapper)`	Returns a copy of `string` with `wrapper` added to the start and end.

An argument in [square brackets] means that it has a default value, and so it isn't necessary to give it a value. ↩
Cased characters are alphabetic characters in either uppercase or lowercase; LETTERS is a string of all cased characters. ↩↩↩↩↩↩↩

string module

`string` module