Return the ASCII code of the argument.

Return the character with the given ASCII code.

• raises Invalid_argument

  if the argument is outside the range 0--255.

Return a string representing the given character, with special characters escaped following the lexical conventions of OCaml.

Convert the given character to its equivalent lowercase character, using the US-ASCII character set.

• since 2.5.0

Convert the given character to its equivalent uppercase character, using the US-ASCII character set.

• since 2.5.0

An alias for the type of characters.

Determine if a character is a whitespace. Whitespace characters are defined as ' ', '\010', '\013', '\009', '\026' and '\012'.

Determine if a character is uppercase ASCII. A character is uppercase ASCII if it is between 'A' and 'Z'

Determine if a character is lowercase ASCII. A character is lowercase ASCII if it is between 'a' and 'z'

Determine if a character is uppercase Latin 1. A character is uppercase Latin 1 if it is between 'A' and 'Z', between 'À' and 'Ö' or between 'Ø' and 'Ý'

Determine if a character is lowercase Latin 1. A character is lowercase Latin 1 if it is between 'a' and 'z', between 'Þ' and 'ö' or between 'ø' and 'ÿ'

Determine if a character is a Latin 1 letter. A character is a Latin 1 letter if it is either an uppercase or a lowercase Latin 1 character.

Determine if a character represents a digit. Digits are '0', '1', ... '9'.

Determine if a character represents a (OCaml-style) symbol. Symbols are '!', '%', '&', '$', '#', '+', '-', '/', ':', '<', '=' '>', '?', '@', '\\', '~', '^', '|', '*'

Determine if a character represents a ASCII letter.

Determine if a character is a newline. Newline characters are defined as '\010' and '\013'

Return the character representing a given digit.

• raises Invalid_argument

  if the argument is outside the range 0--9

Produce the enumeration of all characters

range from ?until produces an enumeration of the characters from from to until included until defaults to '\255'

Produce the enumeration of a segment of characters.

'a' -- 'z' is the enumeration of all characters between 'a' and 'z' included.

The comparison function for characters, with the same specification as Pervasives.compare. Along with the type t, this function compare allows the module Char to be passed as argument to the functors Set.Make and Map.Make.