Puppet users - Aug 2014 - Unrecognised escape sequence '\[' in file

I am having to escape a regular expression in my match and puppet complains 
on the puppetmaster of an "Unrecognised escape sequence". How do I fix
this
so the logs don't get cluttered with this message? I am using Puppet 3.6.2.

 file_line { "nagios_monitor_check_${title}":
    path   => '/etc/nagios/nrpe.cfg',
    line   => 
"command[check_${title}]=/usr/lib64/nagios/plugins/check_procs 
${proc_check} ${proc_count}",
    match  => "^command\[check_${title}\]=.*",
    notify => Service[nrpe],
  }

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