如何在Perl中獲取字符串的長度？

Question

什麼是strlen()的Perl等效物？

Answer 1

perldoc -f length 

    length EXPR 
    length Returns the length in characters of the value of EXPR. If EXPR is 
      omitted, returns length of $_. Note that this cannot be used on an 
      entire array or hash to find out how many elements these have. For 
      that, use "scalar @array" and "scalar keys %hash" respectively. 

      Note the characters: if the EXPR is in Unicode, you will get the num- 
      ber of characters, not the number of bytes. To get the length in 
      bytes, use "do { use bytes; length(EXPR) }", see bytes. 

Answer 2

length($string) 

Answer 3

雖然「長度（）」是應該在任何理智的代碼中使用的正確答案，Abigail's length horror應當提到，如果只爲Perl知識的緣故。

基本上，訣竅在於使用包羅萬象的轉換操作符的返回值：

print "foo" =~ y===c; # prints 3 

Ÿ/// C替換所有字符本身（感謝補充選項「C」），並返回被替換的字符數（有效的是字符串長度）。

Answer 4

的length()功能：

$string ='String Name'; 
$size=length($string);