Alternate solution. Let perl do the work for you.
#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11145686
use warnings;
open my $fh, '<', \<<END or die; # FIXME for testing
first junk line then a blank line
another junk line
fieldname1,fieldname2
value1,value2
more,body
and,still
more,body
END
do { local $/ = "fieldname"; <$fh> }; # read through "fieldname"
my $header_line = "fieldname" . <$fh>; # complete the line
print "header: $header_line";
while( <$fh> ) # FIXME for testing
{
print " body: $_";
}
Outputs:
header: fieldname1,fieldname2
body: value1,value2
body: more,body
body: and,still
body: more,body
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