* parser.l: Adding an explicit lexical rule to

catch backslashes occurring within a regex, not followed by a
character. This can happen in dynamically parsed regexes
such as "abc\\".

2 files changed, 12 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index b3ecc3a1..9cbb1bb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2014-06-05  Kaz Kylheku  <kaz@kylheku.com>
 
+	* parser.l: Adding an explicit lexical rule to
+	catch backslashes occurring within a regex, not followed by a
+	character. This can happen in dynamically parsed regexes
+	such as "abc\\".
+
+2014-06-05  Kaz Kylheku  <kaz@kylheku.com>
+
 	* parser.l (yylex_destroy): Only rely on the FLEX_ version
 	numbers if they are defined. In a newer flex, they are prefixed
 	by YY_.
diff --git a/parser.l b/parser.l
index a49e43d5..fa3c88cb 100644
--- a/parser.l
+++ b/parser.l
@@ -751,6 +751,11 @@ UONLY   {U2}{U}|{U3}{U}{U}|{U4}{U}{U}{U}
   return REGCHAR;
 }
 
+<REGEX>[\\] {
+  yyerrprepf(lit("dangling backslash in regex"), nao);
+  return ERRTOK;
+}
+
 <REGEX>{UANYN}  {
   wchar_t buf[8];
   utf8_from(buf, yytext);