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String Literals in Perlby root (Monk) |
on Nov 05, 1999 at 02:26 UTC ( [id://945]=perltutorial: print w/replies, xml ) | Need Help?? |
In perl there are two ways to represent string literals: single-quoted strings and double-quoted strings. Single-Quoted Strings Single quoted are a sequence of characters that begin and end with a single quote. These quotes are not a part of the string they just mark the beginning and end for the Perl interpreter. If you want a ' inside of your string you need to preclude it with a \ like this \' as you'll see below. Let's see how this works below. 'four' #has four letters in the string 'can\'t' #has five characters and represents "can't" 'hi\there' #has eight characters and represents"hi\\there" (one \ in the string) 'blah\\blah' #has nine characters and represents "blah\\blah" (one \ in the string)If you want to put a new line in a single-quoted string it goes something like this 'line1 line2' #has eleven characters line1, newline character, and then line2Single-quoted strings don't interpret \n as a newline. Double-Quoted Strings Double quoted strings act more like strings in C or C++ the backslash allows you to represent control characters. Another nice feature Double-Quoted strings offers is variable interpolation this substitutes the value of a variable into the string. Some examples are below $word="hello"; #$word becomes hello $statement="$word world"; #variable interpolation, $statement becomes "hello world" "Hello World\n"; #"Hello World" followed by a newline Some of the things you can put in a Double-Quoted String
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