The term "PCRS" is used several times in the Privoxy documentation, including the following at the beginning of http://www.privoxy.org/user-manual/appendix.html:
'Privoxy uses Perl-style "regular expressions" in its actions files and filter file, through the PCRE and PCRS libraries.'
Another example is at the end of the first block of text in http://www.privoxy.org/user-manual/filter-file.html:
'you ... may want to look at the PCRS documentation for the subtle differences to Perl behaviour.'
I haven't found a definition of the term "PCRS" anywhere in the Privoxy documentation or on the Web. I also haven't found any further documentation about a "PCRS library." For example, my Linux package management program lists "libpcre3" as a dependency for Privoxy, but there don't seem to be any dependencies with "pcrs" in the name.
Even though the answers may be obvious, it would be nice if they could be added to the Privoxy documentation. Thanks.