Escape Systems

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

• HTML represents all ASCII character with &#ddd where ddd is the three-digit ASCII code in base-10.
• For how to use the “Ignore New Line” in Python, see here.
• What does the bell do?
• What does the backspace do?
• What is CR, LF, FF?

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(�)	\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.