Host regex condition

Host regex conditions are used when host wildcard conditions are not powerful enough for matching the URLs. Though they can make full use of JavaScript regexes, they are slower.

Example

This pattern mimics the localHostOrDomainIs PAC function: ^test(.example.com)?$

Matching: test, test.example.com

Not matching: test.example.test, test2, test2.example.com

host_regexp (slow, include localHostOrDomainIs)

Design goals

Regexes create new Regexp(...) when called, so they are sure to be slow. Because regexes are too complex, the extension should not try to optimize them.

Regex conditions should not be used when wildcards are okay.