All /m does is to make ^ and $ match start and end of line anywhere in the string (rather than match beginning and end of whole string).
You don't have to use /m just because your string contains multiple lines, unless your match has a ^ or $ in it and you expect the match to be looked for on each line.
/s makes . match a newline, which otherwise it won't.
Anti-nuisance lawsuit warning: The purpose of these notes is to remind me, Zoegond, of stuff or to help me work stuff out. They may contain mistakes.
Quick
- ($a, $b....) = unpack("A2A7...", $packed)
- push( array, list )