From d9fa9bddda3783a2c6784b5d2d416580f106b57a Mon Sep 17 00:00:00 2001
From: Elara Musayelyan <elara@elara.ws>
Date: Mon, 23 May 2022 02:40:16 -0700
Subject: [PATCH] Prevent panic for zero-length input

---
 pcre.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pcre.go b/pcre.go
index 1036598..024c719 100644
--- a/pcre.go
+++ b/pcre.go
@@ -574,6 +574,10 @@ func replaceBytes(src, repl []byte, sOff, eOff lib.Tsize_t, diff int64) (int64,
 // match calls the underlying pcre match functions. It re-runs the functions
 // until no matches are found if multi is set to true.
 func (r *Regexp) match(b []byte, options uint32, multi bool) ([][]lib.Tsize_t, error) {
+	if len(b) == 0 {
+		return nil, nil
+	}
+	
 	r.mtx.Lock()
 	defer r.mtx.Unlock()