code: function ( qu, value ) {
  		var r = new RegExp( qu.operands[0], qu.options );
  		return r.test( value );
  	}
docs: Performs a regular expression test againts the field
  `{field: {$regex: re, $options: reOptions}}`
  @name $regex
  @memberOf module:documents/probe.queryOperators
  @example
  var probe = require("documents/probe");
  probe.find( data, {"name.first" : {$regex : "m*", $options : "i"}} );