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In Perl, what is the difference between ' and " ?
For example, I have 2 variables like below:
$var1 = '\('; $var2 = "\("; $res1 = ($matchStr =~ m/$var1/); $res2 = ($matchStr =~ m/$var2/); The $res2 statement complains that Unmatched ( before HERE mark in regex m.
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The main difference between double quotes and single quotes is, double quotes are used to denote a speech or a quotation whereas single quotes are used to indicate quote within a quotation.
A single-quoted string does not have variables within it interpreted. A double-quoted string does. Also, a double-quoted string can contain apostrophes without backslashes, while a single-quoted string can contain unescaped quotation marks.
The most common reason to use single quotation marks is to quote someone who is quoting someone else. The rules are different in British English, but in American English, you enclose the primary speaker's comments in double quotation marks, and then you enclose the thing they are quoting in single quotation marks.
Double quotes use variable expansion. Single quotes don't
In a double quoted string you need to escape certain characters to stop them being interpreted differently. In a single quoted string you don't (except for a backslash if it is the final character in the string)
my $var1 = 'Hello'; my $var2 = "$var1"; my $var3 = '$var1'; print $var2; print "\n"; print $var3; print "\n"; This will output
Hello $var1 Perl Monks has a pretty good explanation of this here
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