regexp
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Tcl 2016 Conference, Houston/TX, US, Nov 14-18
Send your abstracts to tclconference@googlegroups.com by Sep 12.

The Spencer regexp engine is shared between Postgres and TCL.

Here is a link to the internal doc of the engine at Postgres: http://git.postgresql.org/gitweb/?p=postgresql.git;a=blob_plain;f=src/backend/regex/README;hb=HEAD

Another engine of interest is IMHO Google's re2: