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  2. Question mark - Wikipedia

    en.wikipedia.org/wiki/Question_mark

    In English, the question mark typically occurs at the end of a sentence, where it replaces the full stop (period). However, the question mark may also occur at the end of a clause or phrase, where it replaces the comma (see also Question comma):

  3. Unicode subscripts and superscripts - Wikipedia

    en.wikipedia.org/wiki/Unicode_subscripts_and...

    Little punctuation is encoded. Parentheses are shown in the basic superscript block above, and the exclamation mark ꜝ is shown in the IPA table below. In a supporting font, a question mark may be created with a superscript gelded question mark and a combining dot below: ˀ̣ .

  4. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    The question mark indicates zero or one occurrences of the preceding element. For example, colou?r matches both "color" and "colour". * ... In Java and Python 3.11+, ...

  5. List of typographical symbols and punctuation marks

    en.wikipedia.org/wiki/List_of_typographical...

    Inverted question and exclamation marks ¡ Inverted exclamation mark: Exclamation mark, Interrobang ¿ Inverted question mark: Question mark, Interrobang < Less-than sign: Angle bracket, Chevron, Guillemet Lozenge: Square lozenge ("Pillow") ☞ Manicule: Index, Obelus: º: Masculine ordinal indicator: Feminine ordinal indicator, Degree sign ...

  6. Specials (Unicode block) - Wikipedia

    en.wikipedia.org/wiki/Specials_(Unicode_block)

    The replacement character (often displayed as a black rhombus with a white question mark) is a symbol found in the Unicode standard at code point U+FFFD in the Specials table. It is used to indicate problems when a system is unable to render a stream of data to correct symbols.

  7. Japanese punctuation - Wikipedia

    en.wikipedia.org/wiki/Japanese_punctuation

    Japanese punctuation (Japanese: 約物, Hepburn: yakumono) includes various written marks (besides characters and numbers), which differ from those found in European languages, as well as some not used in formal Japanese writing but frequently found in more casual writing, such as exclamation and question marks.

  8. Metacharacter - Wikipedia

    en.wikipedia.org/wiki/Metacharacter

    A metacharacter is a character that has a special meaning to a computer program, such as a shell interpreter or a regular expression (regex) engine.. In POSIX extended regular expressions, there are 14 metacharacters that must be escaped — preceded by a backslash (\) — in order to drop their special meaning and be treated literally inside an expression: opening and closing square brackets ...

  9. Illegal character - Wikipedia

    en.wikipedia.org/wiki/Illegal_character

    In the Windows operating system, illegal characters in file and folder names include colons, brackets, question marks, [3] and null characters. [ 4 ] Illegal characters in Windows file names [ 4 ]