Returns the length incharacters 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, usescalar @array andscalar keys %hash respectively.
Note thecharacters: if the EXPR is in Unicode, you will get the number of characters, not the number of bytes. To get the length in bytes, usedo { use bytes; length(EXPR) }, seebytes.
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