rssc provides a real-time, self-hostable regex-oriented customization service for atom, rss and json feeds.

rssc uses get request parameters to read user’s preferences. following are the supported parameters:

• src: the source URL of the feeds. Example: https://hnrss.org/newest
• t: the type of desired feeds (that rssc will return), can be rss, atom or json.
• descriptionf: regular expression filter to filter feeds based on the description property.
• titlef: regular expression filter to filter feeds based on the title property.
• contentf: regular expression filter to filter feeds based on the content property.
• linkf: regular expression filter to filter feeds based on the link property.
• net: boolean (1 or 0) (default to 0 when omitted) whether to use the .NET engine regex instead of Go’s.

All regex should be valid RE2 regex syntax (in case of net, see MS’ Regular Expression Language).

Replace https://rssc.fly.dev/ in the following examples with your instance of rssc (can be a localhost:8080 if self-hosted).

• Get all new feeds that contain the word “emacs” but not the word “vim”, and not posted by user lr0 (hnrss.org does not provide a creator/author property, so the author filter here is only for a demonstration purpose.):

  https://rssc.fly.dev/rss?src=https://hnrss.org/newest?q=emacs&titlef=^(?!.*\bvim\b).*\bEmacs\b.*&net=1&authorf=^(?!.*\blr0\b).*$

  Do note that net is used here because RE2 does not support lookarounds.

• Get geopolitical updates from your favorite hacker and skip all free software movement blessed propaganda:

  https://rssc.fly.dev/rss?src=https://stallman.org/rss/rss.xml&contentf=^(?=.*(?:palestine|syria|egypt|iraq|israel|algeria|morocco))(?!.*(?:linux|gnu|software|programming|program)).*$&net=1

• Get BBC middle east updates, only ones that are related to Palestine:

  https://rssc.fly.dev/rss?src=http://feeds.bbci.co.uk/news/world/middle_east/rss.xml&titlef=(?i)palestine|palestinian|gaza

To host rssc locally, install it using Go:

go install github.com/larrasket/rssc@latest

Set environment variable for PORT, if user doesn’t set a PORT value, rssc will use :8080 by default.

PORT=4040 rssc

Now rssc should be running at localhost:4040. You can use the same examples provided, with replacing fly domain with your localhost.

• RE2 is much safer than the .NET Regex, that’s to say, all the good features that .NET engine enables you to use come with a risk cost and ends up enabling catastrophic backtracking, therefore a timeout of 5 seconds is currently enabled on the fly.dev instance when using net=1.
• rssc is pre-alpha. Please report bugs here (url)