Why not use more modern regex tools?

[jfb]

Did you have any performance problems while you had regex entries?

Regex is a bit slower than searching gravity, but you are dealing with nanoseconds (or at most milliseconds) and would typically see zero impact that you can perceive.

Here is some background reading:

Collection of RegEx for blacklisting

No, I should correct this. Regex and exact domains work very much differently: Gravity and exact blacklist domains are stored in a tree-structure. Scanning the tree for matching a single domain against (multiple!) millions of domain merely takes microseconds, even on Raspberry Pi hardware. This is because leafs can be found very efficiently in a balanced tree and searching the tree only becomes slower on a logarithmic scale (doubling the number of domains just means one step more work, not dou…