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# Compiles each pattern once since m// realises
# you're using the same pattern twice in a row.
...
      /$re/
   }
}

# Compiles each pattern twice
for (1..2) {
...
      /$re/
   }
}

# Compiles each pattern once
my @res = map qr/$_/, qw( foo bar );
...
      /$re/
   }
}

# Doesn't recompile $re if it's a qr//.
/$re/
...
# Stringifies and recompiles $re if it's a qr//,
# but it should be subject to the caching mentioned above.
/x$re/