The difference between single and double quotes : Quotations « String « Perl






  1. Perl
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  3. Quotations

The difference between single and double quotes

     

Perl uses single (') or double (") quotes to indicate the start and end of text strings. 
Perl provides less interpretation of what's in a single-quoted string. 

In a single-quoted string:
\n is two characters, a backslash and an n.
\' and \\ are the only allowed backslash escapes.
The value of variables are not substituted, so that '$var', for example, is simply a dollar sign and the letters v-a-r.

You can have a real newline in the text, such as the following:
'line 1 
line 2' 

Double quotes
You can use the full set of backslash escapes, such as \t for a tab and \n for a newline.
You can substitute the value of variables, such as $var.
You can also embed a newline in the string, as you can for single-quoted strings:

"line 1 
line 2"








Related examples in the same category

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2.Alternative Quotes: qq, q, qw, qx
3.Alternative delimiters can be used for all four of the q constructs.
4.Assign returning value from qw to an array
5.Backquotes and command substitution
6.Backslash Escapes in Perl
7.Demonstrating the qw operator
8.Display double quotation marks in a printed string
9.Double quote string
10.Double quote with windows file path
11.Escape double quote
12.Escape double quote in double quote
13.Escaping the double quote
14.If a string is enclosed in single quotes, it is printed literally (what you see is what you get).
15.Interpolate and double quote
16.Nested alternative quotes
17.Perl 5 Quotation Marks
18.Perl's Alternative Quotes
19.Print with double vs. single quotes
20.Printing without Quotes: The here document
21.Properties of printing with single quotes
22.Put double quote into single quote
23.Put qotation marks in q function
24.Put single quote into double quote
25.Quote Operators
26.Quote with qq# (number sign)
27.Quote with qq< (less than)
28.Quote with qq( (parenthesis)
29.Quote with qq| (bar)
30.Single quote string
31.Single quote with windows file path
32.Single quotes do not interpret
33.Single quotes interpret
34.The qq operator does the same for double-quoted strings
35.Using alternative quotes
36.Using backslash for double quote
37.Using qq for quote
38.Using qw to assign value to scalar
39.Using qw to create string array without quotation marks
40.When a string is enclosed in double quotes, scalar variables and arrays are interpolated.
41.You can change the delimiters with the q operator
42.\n with double quotation
43.$statement = q/print "Hello.";/;
44.$statement = qq/print "Hello.";/;
45.qx command
46.All Perl math operations are performed on double-precision floating-point values.
47.assigns a single quote
48.interpolation with with double quote
49.print qq|I said, "Hello".|;
50.qq function with variable interpolation
51.qw across more than one lines
52.Turn off the special effect a backslash has, and so we escape it:
53.Assigning a double quote by \"
54.Alternative Delimiters
55.Using backticks to capture program output.
56.`` returns the result of an shell command