use strict;
my $str = '
"display_name":"test","game":"test123"';
my $regex = qr;\"display_name\":\"([^\"]*)\",\"game\";mp;
my $subst = '';
my $result = $str =~ s;$regex;$subst;rg;
print "The result of the substitution is' $result\n";
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html