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An asterisk before a parenthesis indicates that the lack of the word or phrase inside is ungrammatical, while an asterisk after the opening bracket of the parenthesis indicates that the existence of the word or phrase inside is ungrammatical—e.g., the following indicates "go the station" would be ungrammatical: go *(to) the station
Bracket, Parenthesis, Greater-than sign, Less-than sign, Guillemet: Bracket ' ’ Apostrophe: Quotation mark, Guillemet, Prime, Grave: Quotation marks in English, Possessive * Asterisk: Asterism, Dagger: Footnote ⁂ Asterism: Dinkus, Therefore sign @ At sign \ Backslash: Slash, Solidus (/) ` Backtick (non-Unicode name) ('Backtick' is an alias ...
2 Control-D has been used to signal "end of file" for text typed in at the terminal on Unix / Linux systems. Windows, DOS, and older minicomputers used Control-Z for this purpose. 3 Control-G is an artifact of the days when teletypes were in use. Important messages could be signalled by striking the bell on the teletype.
The canonical example of a context-free grammar is parenthesis matching, which is representative of the general case. There are two terminal symbols "(" and ")" and one nonterminal symbol S. The production rules are S → SS, S → (S), S → ()
P, Punctuation mark : Pd: Punctuation, dash: Graphic: Character: 25: Includes several hyphen characters : Ps: Punctuation, open: Graphic: Character: 75: Opening ...
For example, many implementations allow grouping subexpressions with parentheses and recalling the value they match in the same expression (backreferences). This means that, among other things, a pattern can match strings of repeated words like "papa" or "WikiWiki", called squares in formal language theory.
Python. The use of the triple-quotes to comment-out lines of source, does not actually form a comment. [19] The enclosed text becomes a string literal, which Python usually ignores (except when it is the first statement in the body of a module, class or function; see docstring). Elixir
For example, an en dash is entered using ⌥ Opt+-; an em dash (—) is entered using ⇧ Shift+ ⌥ Opt+-. Also on a Macintosh pressing and holding certain letters (the vowels and a few other letters) brings up a pop-up menu of related special characters, such as accented versions of vowels, which can be clicked on or selected numerically.