This patch should not change behavior. It typically omits backslashes where they are redundant (e.g., in the string literal "^\$"). In a few places, insert backslashes where they make regular expressions clearer: e.g., replace "^\*" (equivalent to "^*") with "^\\*", which has the same effect as a regular expression. Also, use ‘\ %’ instead of ‘\%’ when avoiding confusion with SCCS IDs, and similarly use ‘\ $’ instead of ‘\$’ when avoiding confusion with RCS IDs, as that makes it clearer that the backslash is intended.
This directory contains files intended to test various aspects of Emacs's functionality. Please help add tests! (Also, see etc/compilation.txt for compilation mode font lock tests.)