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/[A-Za-z0-9._%-]\@[A-Za-z0-9_%-.].[com]/ and say "'$_' matched"
  for 'x@zzc', 'a b c@c!c', '?@?@?e@a.m';
...
'x@zzc' matched
'a b c@c!c' matched
'?@?@?e@a.m' matched