$foo = "bungling";
$foo =~ /(ngl.)/; ## $1 is now "ngli"
$matched = $1;     ## $matched = "ngli"
$foo =~ /bung(ngl.)/;  ##  No match!
$matched2 = $1;  ## $matched 2 is now "ngli"



##</code><code>##

$_="tricky";  ## usually not assigned explicitly, typically comes in during a for loop
/tr(.{3})y/;
print $1;    # $1 = "ick"