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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 |