Resource locator remarketing

1. A method implemented by one or more data processing apparatus, the method comprising:

receiving resource locator data generated by a script embedded in a resource, the resource locator data specifying a resource that was visited by a user device identified by a device identifier;

identifying a content feed associated with a publisher of the resource, the content feed including one or more regular expressions, each regular expression specifying a set of matching character strings and having a corresponding set of content items that are eligible to be provided to user devices that submitted resource locator data matching one of the one or more regular expressions;

identifying, from the regular expressions included in the content feed, a first matching regular expression that matches the resource locator data generated by the script;

selecting a content item from the set of content items that corresponds to the first matching regular expression; and

providing data that causes presentation of the selected content item to the user device.

2. The method of claim 1 , further comprising:

obtaining, from a website for the publisher, resource locators for each of a plurality of resources included in the website;

generating, from the resource locators, one or more regular expressions, where each regular expression matches at least one of the resource locators obtained from the website, and wherein each of the resource locators obtained from the website matches at least one of the one or more regular expressions;

generating a content feed for the publisher, the content feed including the one or more regular expressions; and

providing the content feed to the publisher.

3. The method of claim 2 , further comprising:

receiving, from the publisher, publisher input that specifies, for one or more of the regular expressions included in the content feed, a set of content items.

4. The method of claim 1 , further comprising:

identifying, from the regular expressions included in the content feed, a second matching regular expression that matches the resource locator data; and

determining that a first priority of the first matching regular expression is greater than a second priority of the second matching regular expression, and wherein the content item is selected from the set of content items that corresponds to the first matching regular expression based on the determination that the first priority of the first matching regular expression is greater than the second priority of the second matching regular expression.

5. The method of claim 4 , further comprising:

determining a priority for each matching regular expression based on a granularity of the regular expression.

6. The method of claim 1 , wherein the resource locator data specifies a location of a resource that was previously visited by the user device.

7. The method of claim 1 , wherein at least one of the one or more regular expressions includes a uniform resource locator and a metacharacter.

8. The method of claim 1 , wherein at least one of the one or more regular expressions includes a keyword and a metacharacter.

9. A system comprising:

a data processing apparatus; and

a data store storing instructions that, when executed by the data processing apparatus, cause the data processing apparatus to perform operations comprising:

receiving resource locator data generated by a script embedded in a resource, the resource locator data specifying a resource that was visited by a user device identified by a device identifier;

identifying a content feed associated with a publisher of the resource, the content feed including one or more regular expressions, each regular expression specifying a set of matching character strings and having a corresponding set of content items that are eligible to be provided to user devices that submitted resource locator data matching one of the one or more regular expressions;

identifying, from the regular expressions included in the content feed, a first matching regular expression that matches the resource locator data generated by the script;

selecting a content item from the set of content items that corresponds to the first matching regular expression; and

providing data that causes presentation of the selected content item to the user device.

10. The system of claim 9 , wherein the operations further comprise:

obtaining, from a website for the publisher, resource locators for each of a plurality of resources included in the website;

generating, from the resource locators, one or more regular expressions, where each regular expression matches at least one of the resource locators obtained from the website, and wherein each of the resource locators obtained from the website matches at least one of the one or more regular expressions;

generating a content feed for the publisher, the content feed including the one or more regular expressions; and

providing the content feed to the publisher.

11. The system of claim 10 , wherein the operations further comprise:

receiving, from the publisher, publisher input that specifies, for one or more of the regular expressions included in the content feed, a set of content items.

12. The system of claim 9 , wherein the operations further comprise:

identifying, from the regular expressions included in the content feed, a second matching regular expression that matches the resource locator data; and

determining that a first priority of the first matching regular expression is greater than a second priority of the second matching regular expression, and wherein the content item is selected from the set of content items that corresponds to the first matching regular expression based on the determination that the first priority of the first matching regular expression is greater than the second priority of the second matching regular expression.

13. The system of claim 12 , wherein the operations further comprise:

determining a priority for each matching regular expression based on a granularity of the regular expression.

14. The system of claim 9 , wherein the resource locator specifies the location of a resource that was previously visited by the user device.

15. A non-transitory computer readable medium comprising instructions that, when executed by a data processing apparatus, cause the data processing apparatus to perform operations comprising:

receiving resource locator data generated by a script embedded in a resource, the resource locator data specifying a resource that was visited by a user device identified by a device identifier;

identifying a content feed associated with a publisher of the resource, the content feed including one or more regular expressions, each regular expression specifying a set of matching character strings and having a corresponding set of content items that are eligible to be provided to user devices that submitted resource locator data matching one of the one or more regular expressions;

identifying, from the regular expressions included in the content feed, a first matching regular expression that matches the resource locator data generated by the script;

selecting a content item from the set of content items that corresponds to the first matching regular expression; and

providing data that causes presentation of the selected content item to the user device.

16. The non-transitory computer readable medium of claim 15 , wherein the operations further comprise:

obtaining, from a website for the publisher, resource locators for each of a plurality of resources included in the website;

generating, from the resource locators, one or more regular expressions, where each regular expression matches at least one of the resource locators obtained from the website, and wherein each of the resource locators obtained from the website matches at least one of the one or more regular expressions;

generating a content feed for the publisher, the content feed including the one or more regular expressions; and

providing the content feed to the publisher.

17. The non-transitory computer readable medium of claim 16 , wherein the operations further comprise:

receiving, from the publisher, publisher input that specifies, for one or more of the regular expressions included in the content feed, a set of content items.

18. The non-transitory computer readable medium of claim 15 , wherein the operations further comprise:

identifying, from the regular expressions included in the content feed, a second matching regular expression that matches the resource locator data; and

determining that a first priority of the first matching regular expression is greater than a second priority of the second matching regular expression, and wherein the content item is selected from the set of content items that corresponds to the first matching regular expression based on the determination that the first priority of the first matching regular expression is greater than the second priority of the second matching regular expression.

19. The non-transitory computer readable medium of claim 18 , wherein the operations further comprise:

determining a priority for each matching regular expression based on a granularity of the regular expression.

20. The non-transitory computer readable medium of claim 15 , wherein the resource locator specifies the location of a resource that was previously visited by the user device.