> perl -we'use strict;use P;      
my $re = qr{ (\w+) }gx;
my $dat = "Just another cats meow";
my @matches = $dat =~ $re;
P "#matches=%s, matches=%s", scalar(@matches), \@matches;
exit scalar(@matches);'
  output:
Having no space between pattern and following word is deprecated at -e line 2.
Bareword found where operator expected at -e line 2, near "qr/ (\w+) /gx"
syntax error at -e line 2, near "qr{ (\w+) }gx"
Execution of -e aborted due to compilation errors.