1 files changed, 9 insertions, 0 deletions

diff --git a/src/regex.c b/src/regex.c
index 09776848220..2eca58c23e8 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -2589,6 +2589,7 @@ regex_compile (pattern, size, syntax, bufp)
   bufp->syntax = syntax;
   bufp->fastmap_accurate = 0;
   bufp->not_bol = bufp->not_eol = 0;
+  bufp->used_syntax = 0;
 
   /* Set `used' to zero, so that if we return an error, the pattern
      printer (for debugging) will think there's no pattern.  We reset it
@@ -3014,6 +3015,14 @@ regex_compile (pattern, size, syntax, bufp)
                               }
                           }
 
+                        /* In most cases the matching rule for char classes
+                           only uses the syntax table for multibyte chars,
+                           so that the content of the syntax-table it is not
+                           hardcoded in the range_table.  SPACE and WORD are
+                           the two exceptions.  */
+                        if ((1 << cc) & ((1 << RECC_SPACE) | (1 << RECC_WORD)))
+                          bufp->used_syntax = 1;
+
                         /* Repeat the loop. */
                         continue;
                       }