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#### POSIX Symbolic Names

The following symbolic names are recognised as valid collating element names, in addition to any single character, this allows you to write for example:

    [[.left-square-bracket.][.right-square-bracket.]]

if you wanted to match either "[" or "]".

Name | Character
--- | ---
NUL | \x00
SOH | \x01
STX | \x02
ETX | \x03
EOT | \x04
ENQ | \x05
ACK | \x06
alert | \x07
backspace | \x08
tab | \t
newline | \n
vertical-tab | \v
form-feed | \f
carriage-return | \r
SO | \xE
SI | \xF
DLE | \x10
DC1 | \x11
DC2 | \x12
DC3 | \x13
DC4 | \x14
NAK | \x15
SYN | \x16
ETB | \x17
CAN | \x18
EM | \x19
SUB | \x1A
ESC | \x1B
IS4 | \x1C
IS3 | \x1D
IS2 | \x1E
IS1 | \x1F
space | \x20
exclamation-mark | !
quotation-mark | "
number-sign | #
dollar-sign | $
percent-sign | %
ampersand | &
apostrophe | '
left-parenthesis | (
right-parenthesis | )
asterisk | *
plus-sign | +
comma | ,
hyphen | -
period | .
slash | /
zero | 0
one | 1
two | 2
three | 3
four | 4
five | 5
six | 6
seven | 7
eight | 8
nine | 9
colon | :
semicolon | ;
less-than-sign | <
equals-sign | =
greater-than-sign | >
question-mark | ?
commercial-at | @
left-square-bracket | [
backslash | \
right-square-bracket | ]
circumflex | ~
underscore | _
grave-accent | `
left-curly-bracket | {
vertical-line | |
right-curly-bracket | }
tilde | ~
DEL | \x7F