my $s='Tue Feb  8 11:11:11 2005: blah blah blah';
my $regex=qr(^$wday $mon\s+$mday \d{2}:\d{2}:\d{2} $year:);

findstring($s);

sub findstring($)
{
  my $line=shift;

  print "found\n" if $line=~/$regex/;
}


##</code><code>##

# interpolate the variables (you have to define your
# variables to interpolate first so they work).
my $regex="^$wday $mon\s+$mday \d{2}:\d{2}:\d{2} $year:";

$regex=qr($regex); # compile the regular expression

##</code><code>##

my $s='Tue Feb  8 11:11:11 2005: blah blah blah';
my $regex=createRegEx('Tue','Feb','8','2005');

findstring($s);

sub findstring($)
{
  my $line=shift;

  print "found\n" if $line=~/$regex/;
}
sub createRegEx($$$$)
{
  my ($wday,$mon,$mday,$year)=@_;

  my $regex="^$wday $mon\s+$mday \d{2}:\d{2}:\d{2} $year:";

  return(qr($regex));
}