1 files changed, 8 insertions, 0 deletions
diff --git a/regex.h b/regex.h
index b6ee9c7..c21c708 100644
--- a/regex.h
+++ b/regex.h
@@ -111,8 +111,16 @@ typedef enum {
 	RE_COMP_NO_GROUPS = 1
 } ReCompFlags;
 
+typedef enum {
+	RE_COMP_ENONE,
+	RE_COMP_ENORPAREN,
+	RE_COMP_ENOLPAREN,
+	RE_COMP_EEOF,
+} ReCompErr;
+
 int re_comp(RegEx *re, Str src, Arena *perm, Arena *scratch);
 int re_comp_ex(RegEx *re, Str src, Arena *perm, Arena *scratch, ReCompFlags flags);
+const char *re_comp_strerror(ReCompErr err);
 
 void re_search_start(ReSearch *s, RegEx *re, Arena *a);
 void re_search_chunk(ReSearch *s, const char *buf, size_t n);