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m/.../ returns true or false in scalar context 
m/.../g give you a list of matches in list context 
m/(...)/ can populate an array with whatever gets captured... (??)
...
foreach( ) i.e. inside parenthesis is evaluated in list context?
 
<STDIN> returns the next line of input in list context

  DB<23> $_="aaa"
 
  DB<24> print scalar m/a/
1

 perl -e 'print prototype "CORE::push","\n"'
\@@