diff: use extended regexp to find hunk headers

Using ERE elements such as "|" (alternation) by backquoting in BRE
is a GNU extension and should not be done in portable programs.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index dabb4b4a021414adb89d5647afe14caaff670a76..175a044a344aa848530e72b16355be9694249494 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1399,20 +1399,23 @@ static const struct funcname_pattern_entry *funcname_pattern(const char *ident)
 }
 
 static const struct funcname_pattern_entry builtin_funcname_pattern[] = {
-       { "java", "!^[  ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
-                       "new\\|return\\|switch\\|throw\\|while\\)\n"
-                       "^[     ]*\\(\\([       ]*"
-                       "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
-                       "[      ]*([^;]*\\)$", 0 },
-       { "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
-                       "destructor\\|interface\\|implementation\\|"
-                       "initialization\\|finalization\\)[ \t]*.*\\)$"
-                       "\\|"
-                       "^\\(.*=[ \t]*\\(class\\|record\\).*\\)$",
-                       0 },
-       { "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$", 0 },
-       { "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$", 0 },
-       { "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$", 0 },
+       { "java",
+         "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
+         "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$",
+         REG_EXTENDED },
+       { "pascal",
+         "^((procedure|function|constructor|destructor|interface|"
+               "implementation|initialization|finalization)[ \t]*.*)$"
+         "|"
+         "^(.*=[ \t]*(class|record).*)$",
+         REG_EXTENDED },
+       { "bibtex", "(@[a-zA-Z]{1,}[ \t]*\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
+         REG_EXTENDED },
+       { "tex",
+         "^(\\\\((sub)*section|chapter|part)\\*{0,1}\{.*)$",
+         REG_EXTENDED },
+       { "ruby", "^[ \t]*((class|module|def)[ \t].*)$",
+         REG_EXTENDED },
 };
 
 static const struct funcname_pattern_entry *diff_funcname_pattern(struct diff_filespec *one)