1 files changed, 47 insertions, 0 deletions
diff --git a/ext/pcre/tests/bug66121.phpt b/ext/pcre/tests/bug66121.phpt
new file mode 100644
index 0000000000..89c2f2d5d8
--- /dev/null
+++ b/ext/pcre/tests/bug66121.phpt
@@ -0,0 +1,47 @@
+--TEST--
+Bug #66121 - UTF-8 lookbehinds match bytes instead of characters
+--FILE--
+<?php
+// Sinhala characters
+var_dump(preg_replace('/(?<!ක)/u', '*', 'ක'));
+var_dump(preg_replace('/(?<!ක)/u', '*', 'ම'));
+// English characters
+var_dump(preg_replace('/(?<!k)/u', '*', 'k'));
+var_dump(preg_replace('/(?<!k)/u', '*', 'm'));
+// Sinhala characters
+preg_match_all('/(?<!ක)/u', 'ම', $matches, PREG_OFFSET_CAPTURE);
+var_dump($matches);
+// invalid UTF-8
+var_dump(preg_replace('/(?<!ක)/u', '*', "\xFCක"));
+var_dump(preg_replace('/(?<!ක)/u', '*', "ක\xFC"));
+var_dump(preg_match_all('/(?<!ක)/u', "\xFCම", $matches, PREG_OFFSET_CAPTURE));
+var_dump(preg_match_all('/(?<!ක)/u', "\xFCම", $matches, PREG_OFFSET_CAPTURE));
+?>
+--EXPECT--
+string(4) "*ක"
+string(5) "*ම*"
+string(2) "*k"
+string(3) "*m*"
+array(1) {
+  [0]=>
+  array(2) {
+    [0]=>
+    array(2) {
+      [0]=>
+      string(0) ""
+      [1]=>
+      int(0)
+    }
+    [1]=>
+    array(2) {
+      [0]=>
+      string(0) ""
+      [1]=>
+      int(3)
+    }
+  }
+}
+NULL
+NULL
+bool(false)
+bool(false)