This post compares escape character in various systems: Java, C, and more…

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This list will be updated.

Control

DES DEC HEX C/C++ C# Java Python JSON
Alert (Bell, Beep) 7 7 \a \a \a
Back Space 8 8 \b \b \b \b \b
New Page (Form Feed) 12 C \f \f \f \f \f
New Line (Line Feed) 10 A \n \n \n \n \n
Ignore New Line \<newline>
Carriage Return 13 D \r \r \r \r \r
Horizontal Tab 9 9 \t \t \t \t \t
Vertical Tab 11 B \v \v \v

Punctuations

DES DEC HEX C/C++ C# Java Python JSON
\ 48 30 \\ \\ \\ \\ \\
/ 92 5C \/
' 39 27 \' \' \' \'
" 34 22 \" \" \" \" \"
? 63 3F \?
  • Escape of special punctuations for Regex depends on implementation. See here.

Numerical value for character Reference

DES C/C++/C# Java Python JSON
octal \ooo \ooo \ooo
hexadecimal \uhhhh
\Uhhhhhhhh
\xhh..		 \uhhhh \uhhhh
\Uhhhhhhhh
\xhh
\N{name}		 \uhhhh
Null(&#000;) \0 \0
  • How interpreters deals with exceeding digits (e.g. \1004) and a number that exceeds range (\xFFFFFFFFFF) and even the range itself depends on implementation.
  • How octal/hexadecimal numbers are mapped to characters depends on language implementation.
  • \x can be followed by any number of hexadecimal digits, and only stop when it meets the first non-dex digit.
  • \0 = \00 = \000 = octal escape for null character.
  • What are octal/hexadecimal ASCII codes for?
  • For a complete list of ASCII characters, see here; for UNICODE, see here; for UNICODE Name aliases, see here.

References

C, C++, Java, C#, Python, JSON.