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-rw-r--r--posix/regex.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/posix/regex.h b/posix/regex.h
index 1ab3e243a7..c76005332d 100644
--- a/posix/regex.h
+++ b/posix/regex.h
@@ -175,6 +175,10 @@ typedef unsigned long int reg_syntax_t;
whether ^ should be special. */
#define RE_CARET_ANCHORS_HERE (RE_ICASE << 1)
+/* If this bit is set, then \{ cannot be first in an bre or
+ immediately after an alternation or begin-group operator. */
+#define RE_CONTEXT_INVALID_DUP (RE_CARET_ANCHORS_HERE << 1)
+
/* This global variable defines the particular regexp syntax to use (for
some interfaces). When a regexp is compiled, the syntax used is
stored in the pattern buffer, so changing this does not affect
@@ -229,7 +233,7 @@ extern reg_syntax_t re_syntax_options;
| RE_INTERVALS | RE_NO_EMPTY_RANGES)
#define RE_SYNTAX_POSIX_BASIC \
- (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
+ (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM | RE_CONTEXT_INVALID_DUP)
/* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this