Merge branch 'jc/grep-pcre-loose-ends'

"git log -F -E --grep='<ere>'" failed to use the given <ere> pattern as extended regular expression, and instead looked for the string literally. The early part of this series is a fix for it; the latter part teaches log to respect the grep.* configuration. * jc/grep-pcre-loose-ends: log: honor grep.* configuration log --grep: accept --basic-regexp and --perl-regexp log --grep: use the same helper to set -E/-F options as "git grep" revisions: initialize revs->grep_filter using grep_init() grep: move pattern-type bits support to top-level grep.[ch] grep: move the configuration parsing logic to grep.[ch] builtin/grep.c: make configuration callback more reusable