app/regex: replace support & polish perl backend

Also, updated the TODO. app/regex is still a heavy WIP.

TODO.org

@@ -89,7 +89,7 @@
     + [ ] twitter
     + [ ] present
 
-** 2.0.3 [22/42]
+** 2.0.3 [23/46]
 + [ ] Test ~package-autoremove~
 + [ ] tools/upload: add ~+upload/open-remote-file~ command to open current file
       on the remote (with TRAMP)
@@ -104,16 +104,21 @@
 + [ ] Write ~describe-setting~ for ~def-setting!~ definitions.
 + [ ] Fix invisible buffer-info segment in modeline for terminal Emacs
 + [ ] ui/doom-modeline: fix ~0/0~ display in modeline (leftover anzu state)
-+ [1/9] New module :: tools/regex (PCRE IDE)
++ [2/13] New module :: tools/regex (PCRE IDE)
   + [X] perl backend
-  + [ ] replace support
-  + [ ] export to code support
-  + [ ] python exporter (use ~re~ or ~regex~)
-  + [ ] php exporter (~preg_(match(_all)?|replace)~)
-  + [ ] ruby backend (~%r[.+]~)
-  + [ ] javascript (node) backend (~/.+/~)
+  + [X] replace support
+  + [-] highlight replaced segments
+  + [0/7] export-to-code feature
+    + [ ] search+replace support
+    + [ ] python exporter (use ~re~ or ~regex~)
+    + [ ] php exporter (~preg_(match(_all)?|replace)~)
+    + [ ] ruby exporter (~%r[.+]~)
+    + [ ] javascript (node) exporter (~/.+/.test(...)~)
+    + [ ] C exporter (~regex.h~ + ~regcomp~)
+    + [ ] C++ exporter (~regex reg(regexp, ...)~)
   + [ ] syntax highlighter for ~+regex-mode~ (plus make it a major mode)
   + [ ] README.org
+  + [ ] Use ~make-process~ daemon approach rather than ~call-process~
 + [X] ui/doom: fix nav-flash on evil-multiedit or in eshell/term buffers
 + [X] core-os: don't use GTK tooltips (ugly!)
 + [X] ui/doom-modeline: reduce excess whitespace on right of flycheck segment