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Signed-off-by: DL6ER <dl6er@dl6er.de>
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DL6ER
2018-07-17 19:55:51 +02:00
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8
docs/ftldns/regex/overview.md
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A regular expression, or RegEx for short, is a pattern that can be used for building arbitrarily complex blocking rules in *FTL*DNS.
We implement the ERE flavor similar to the one used by the UNIX `egrep` (or `grep -E`) command.
We implement the POSIX Extended Regular Expressions similar to the one used by the UNIX `egrep` (or `grep -E`) command.
Our implementation is computationally inexpensive as each domain is only checked once for a match (if you query `google.com`, it will be checked against your RegEx. Any subsequent query to the same domain will not be checked again until you restart `pihole-FTL`).
Our implementation is light and fast as each domain is only checked once for a match (if you query `google.com`, it will be checked against your RegEx. Any subsequent query to the same domain will not be checked again until you restart `pihole-FTL`).
## How to use regular expressions for blocking
*FTL*DNS reads in regular expression filters from `/etc/pihole/regex.list` (one expression per line, lines starting with `#` will be skipped).
To tell *FTL*DNS to reload the list, either:
- Execute the `>recompile-regex` API command (`echo ">recompile-regex" | nc localhost 4711`)
- Send `SIGHUP` to `pihole-FTL` (`sudo killall -SIGHUP pihole-FTL`)
- Execute the `>recompile-regex` API command (`echo ">recompile-regex" | nc localhost 4711`) or
- Send `SIGHUP` to `pihole-FTL` (`sudo killall -SIGHUP pihole-FTL`) or
- Restart the service (`sudo service pihole-FTL restart`)
## Pi-hole Regex debugging mode