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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 ...
Bracketed question marks can be used for rhetorical questions, for example Oh, really(?), in informal contexts such as closed captioning. The question mark can also be used as a meta-sign to signal uncertainty regarding what precedes it. It is usually put between brackets: (?).
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 ...
The question mark indicates zero or one occurrences of the preceding element. For example, colou?r matches both "color" and "colour". The asterisk indicates zero or more occurrences of the preceding element.
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.
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. [6]
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 ]
In certain computer programming languages, the Elvis operator, often written ?:, is a binary operator that returns the evaluated first operand if that operand evaluates to a value likened to logically true (according to a language-dependent convention, in other words, a truthy value), and otherwise returns the evaluated second operand (in which case the first operand evaluated to a value ...