url encode and url decode in Perl

url-encode:
$str =~ s/([^A-Za-z0-9])/sprintf("%%%02X", ord($1))/seg;
url-decode:
$str =~ s/\%([A-Fa-f0-9]{2})/pack('C', hex($1))/seg;

Onliner's:

• Urlencode：对 \n 不转码
  perl -p -e 's/([^\w\-\.\@])/$1 eq "\n" ? "\n":sprintf("%%%2.2x",ord($1))/eg' keywords.list
• UrlDecode：
  perl -p -e 's/%(..)/pack("c", hex($1))/eg' query.log