From 06785bac1a21fccc38f32270ebc8e41385143290 Mon Sep 17 00:00:00 2001
From: Elara Musayelyan <elara@elara.ws>
Date: Sat, 21 May 2022 11:45:30 -0700
Subject: [PATCH] Add names to ReplaceAll syntax

---
 pcre.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pcre.go b/pcre.go
index a718de7..f46fb1f 100644
--- a/pcre.go
+++ b/pcre.go
@@ -370,7 +370,8 @@ func (r *Regexp) NumSubexp() int {
 // regular expression with the replacement text repl.
 // Inside repl, $ signs are interpreted as in Expand,
 // so for instance $1 represents the text of the first
-// submatch.
+// submatch and $name would represent the text of the
+// subexpression called "name".
 func (r *Regexp) ReplaceAll(src, repl []byte) []byte {
 	matches, err := r.match(src, 0, true)
 	if err != nil {
@@ -388,7 +389,10 @@ func (r *Regexp) ReplaceAll(src, repl []byte) []byte {
 		replStr := os.Expand(string(repl), func(s string) string {
 			i, err := strconv.Atoi(s)
 			if err != nil {
-				return ""
+				i = r.SubexpIndex(s)
+				if i == -1 {
+					return ""
+				}
 			}
 
 			// If there given match does not exist, return empty string