Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var regex = new RegExp(/^(contact|billing|delivery)_(company_name|name|lastname|email|acode_home|acode_work|phone_home|phone_work|phone_mobile|address_1|address_2|zip_suburb|suburb|state|zip|country)/);
    var regex2 = /^(contact|billing|delivery)_(company_name|name|lastname|email|acode_home|acode_work|phone_home|phone_work|phone_mobile|address_1|address_2|zip_suburb|suburb|state|zip|country)/;
  };
</script>

Test runner

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var string = 'contact_name';
string.replace(regex, '$2');

var string = 'contact_name';
string.replace(/^(contact|billing|delivery)_(company_name|name|lastname|email|acode_home|acode_work|phone_home|phone_work|phone_mobile|address_1|address_2|zip_suburb|suburb|state|zip|country)/, '$2')

var string = 'contact_name';
string.replace(regex2, '$2')

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