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Comment on  "The parentheses are used for the repeat factor. All
my research on the internet indicates a multi-character pattern
that needs to be repeated multiple times should be enclosed in
parentheses. Is this not correct?"  Here's a test showing
clustering and capturing. Both match as expected. Capturing also
sets $1.  $ perl -Mstrict -Mwarnings -E ' my $re1 =
qr{PV1\|1\|O\|(?:[^|]*\|){3}\|}; my $re2 =
qr{PV1\|1\|O\|([^|]*\|){3}\|}; my $x =
q{PV1|1|O|F3|F4|F5|F6|F7}; my $y = q{PV1|1|O|F3|F4|F5||F7}; say
"------- Clustering -------"; say "Match in \$x" if $x =~
/$re1/; say $1 if $1; say "Match in \$y" if $y =~ /$re1/; say $1
if $1; say "------- Capturing -------"; say "Match in \$x" if $x
=~ /$re2/; say $1 if $1; say "Match in \$y" if $y =~ /$re2/; say
$1 if $1; ' ------- Clustering ------- Match in $y -------
Capturing ------- Match in $y F5|  -- Ken  In reply to Re^3:
Selecting HL7 Tra