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Escape Code

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Escape Code

Escape Code

by David Stanley

The concept of PERL escape code is the same as HTML escape code. It is a way to enter a specific feature or character "outside" of the normal coding (usually to appear on the web page itself).

For example... to show double quotes on the web page :

Regular document	HTML Escape	PERL Escape
"	"	"

Quick examples :

Coding input :	"Hello 'World'" "Hello '"World""
Page output :	Hello 'World' Hello "World"

Common escape sequences :

a	Beep
	Backspace
c	"Control" caracter. cD = CTRL-D
e	Escape
f	Form feed
l	Make the next letter lowercase
	New line, return.
	Carriage return.
	Tab.
u	Make the next letter uppercase
x	Enables hex numbers
v	Vertical tab
\	Print backslash
"	Print double quotes
	Escape next character if known otherwise print. Also allows octal numbers.
L	Make all letters lowercase until the E
U	Make all letters uppercase until the E
Q	Add a backslash-quote to all the nonalphanumerics until the E
E	Terminates the effects of L, U, or Q