Merge branch 'tr/diff-words-test'

* tr/diff-words-test:
  t4034 (diff --word-diff): add a minimum Perl drier test vector
  t4034 (diff --word-diff): style suggestions
  userdiff: simplify word-diff safeguard
  t4034: bulk verify builtin word regex sanity

diff --cc userdiff.c
index 9ebf231ea5ee2e7fd1f71c9557a6537d29428d8d,3a1c392bbd76b167847f7a3b164f0135eb66740e..1ff47977d549992ada8c1236187d4516b648ee7d
--- 1/userdiff.c
--- 2/userdiff.c
+++ b/userdiff.c
@@@ -49,10 -49,9 +49,9 @@@ PATTERNS("objc"
         /* -- */
         "[a-zA-Z_][a-zA-Z0-9_]*"
         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
-        "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
-        "|[^[:space:]]|[\x80-\xff]+"),
+        "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
  PATTERNS("pascal",
 -       "^((procedure|function|constructor|destructor|interface|"
 +       "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
                "implementation|initialization|finalization)[ \t]*.*)$"
         "\n"
         "^(.*=[ \t]*(class|record).*)$",