diff --git a/diff.c b/diff.c
index 175a044a344aa848530e72b16355be9694249494..a28373861689d1baf02ffdf969da1e843ea9c237 100644
--- a/diff.c
+++ b/diff.c
@@ -1409,10 +1409,10 @@ static const struct funcname_pattern_entry builtin_funcname_pattern[] = {
 	  "|"
 	  "^(.*=[ \t]*(class|record).*)$",
 	  REG_EXTENDED },
-	{ "bibtex", "(@[a-zA-Z]{1,}[ \t]*\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
+	{ "bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 	  REG_EXTENDED },
 	{ "tex",
-	  "^(\\\\((sub)*section|chapter|part)\\*{0,1}\{.*)$",
+	  "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 	  REG_EXTENDED },
 	{ "ruby", "^[ \t]*((class|module|def)[ \t].*)$",
 	  REG_EXTENDED },