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-rw-r--r--Src/pattern.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/Src/pattern.c b/Src/pattern.c
index 68a340919..04d3e3dfb 100644
--- a/Src/pattern.c
+++ b/Src/pattern.c
@@ -2224,8 +2224,10 @@ pattryrefs(Patprog prog, char *string, int stringlen, int unmetalenin,
 	maxnpos = *nump;
 	*nump = 0;
     }
-    /* inherited from domatch, but why, exactly? */
-    if (*string == Nularg) {
+    /*
+     * Special signalling of empty tokenised string.
+     */
+    if ((!patstralloc || stringlen > 0) && *string == Nularg) {
 	string++;
 	if (unmetalenin > 0)
 	    unmetalenin--;
@@ -2233,8 +2235,10 @@ pattryrefs(Patprog prog, char *string, int stringlen, int unmetalenin,
 	    stringlen--;
     }
 
-    if (stringlen < 0)
+    if (stringlen < 0) {
+	DPUTS(patstralloc != NULL, "length needed with patstralloc");
 	stringlen = strlen(string);
+    }
     origlen = stringlen;
 
     if (patstralloc) {