Improve new syntax files and fix a region glitch

runtime/syntax/makefile.yaml

@@ -1,14 +1,14 @@
 filetype: makefile
 
-detect: 
+detect:
     filename: "([Mm]akefile|\\.ma?k)$"
     header: "^#!.*/(env +)?[bg]?make( |$)"
 
 rules:
-    - preproc: "\\b(ifeq|ifdef|ifneq|ifndef|else|endif)\\b"
-    - preproc: "^(export|include|override)\\b"
-    - symbol.operator: "^[^:=	]+:"
-    - symbol.operator: "[=,%]|\\+=|\\?=|:=|&&|\\|\\|"
+    - preproc: "\\<(ifeq|ifdef|ifneq|ifndef|else|endif)\\>"
+    - statement: "^(export|include|override)\\>"
+    - operator: "^[^:=	]+:"
+    - operator: "([=,%]|\\+=|\\?=|:=|&&|\\|\\|)"
     - statement: "\\$\\((abspath|addprefix|addsuffix|and|basename|call|dir)[[:space:]]"
     - statement: "\\$\\((error|eval|filter|filter-out|findstring|firstword)[[:space:]]"
     - statement: "\\$\\((flavor|foreach|if|info|join|lastword|notdir|or)[[:space:]]"
@@ -16,9 +16,20 @@ rules:
     - statement: "\\$\\((value|warning|wildcard|word|wordlist|words)[[:space:]]"
     - identifier: "^.+:"
     - identifier: "[()$]"
-    - constant.string: "\"(\\\\.|[^\"])*\"|'(\\\\.|[^'])*'"
+    - constant.string:
+        start: "\""
+        end: "\""
+        rules:
+            - constant.specialChar: "\\\\."
+    - constant.string:
+        start: "'"
+        end: "'"
+        rules:
+            - constant.specialChar: "\\\\."
     - identifier: "\\$+(\\{[^} ]+\\}|\\([^) ]+\\))"
     - identifier: "\\$[@^<*?%|+]|\\$\\([@^<*?%+-][DF]\\)"
     - identifier: "\\$\\$|\\\\.?"
-    - comment: "(^|[[:space:]])#([^{].*)?$"
-    - comment: "^	@#.*"
+    - comment:
+        start: "#"
+        end: "$"
+        rules: []