escape = This example of escape - Hello, World12345 标量运算 您将在单独的章节中看到Perl中可用的各种运算符的详细信息,但在这里我们将列出一些数字和字符串运算。 #!/usr/bin/perl$str ="hello"."world";# Concatenates strings.$num =
$var_string="Rain-Drops-On-Roses-And-Whiskers-On-Kittens"; $var_names="Larry,David,Roger,Ken,Michael,Tom"; # transform above strings into arrays. @string=split('-', $var_string); @names =split(',', $var_names); $string1=join( '-', @string ); $string2=join( ',', @names )...
The length function works only on strings, not on arrays. An array stores an ordered list and is preceded by an @ sign and populated using parentheses. To find out the length of an array, use the scalarfunction. For example: 应数是“6”,即数组中的项数。标量是数据的单个单位。它可以是一...
@array[0,1] = ("string", 46); # @array =("string",46,3,4,5) now @array[0..3] = (11, 22, 33, 44); # @array = (11,22,33,44,5) now @array[1,2,3] = @array[3,2,4]; # @array = (11,44,33,5,5) now @array[0..2] = @array[3,4]; # @array = (5,5...
EN在进行字符串处理和文本分析时，有时我们需要从字符串列表中删除特殊字符。特殊字符可能是空格、标点...
2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Much more civil, isn't it? The following example, sorts an array of strings in reverse: AI检测代码解析 [liuguiyou@localhost perl]$ cat sort_chara.pl #!/usr/bin/perl ...
#数组排序my@numbers =sort{$a <=> $b} @some_numbers;#数值my@string =sort{$a cmp $b} @some_strings;#字符串my@descending =reversesort{$a <=> $b} @some_numbers;my@descending =sort{$b <=> $a} @some_numbers;#结果同上#哈希值排序sortkeys%hash#这是对键排序sort{$hash{$b} <=> ...
Scalardata types, which store numbers, strings and references, are preceded by$. Arrays, which store ordered lists of scalars, are preceded by@. Hashes, which store sets of Key-value pairs, are preceded by%. To declare a simple string, which is a scalar data type,$should be used: ...
Perhaps I want to match the names on either side of one of the conjunctionsandoror. In@arrayI have some strings that express pairs. The conjunction may change, so in my regex I use the alternationand|or. My problem is precedence.The alternation is higher precedence than sequence, so I ne...
A string in Perl is not an array of characters—nor of bytes, for that matter. You cannot use array subscripting on a string to address one of its characters; use substr for that. Like all data types in Perl, strings grow on demand. Space is reclaimed by Perl’s garbage collection sys...