https://git.ruby-lang.org/ruby.git/commit/?id=c5570a7c11

From c5570a7c11ba0872e171500a548f2ecb82e94588 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 11 Sep 2021 22:50:59 +0900
Subject: Extract backref_number_check

---
 re.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/re.c b/re.c
index 4840ce0..2afa824 100644
--- a/re.c
+++ b/re.c
@@ -1159,6 +1159,13 @@ name_to_backref_error(VALUE name) https://github.com/ruby/ruby/blob/trunk/re.c#L1159
 	     name);
 }
 
+static void
+backref_number_check(struct re_registers *regs, int i)
+{
+    if (i < 0 || regs->num_regs <= i)
+	rb_raise(rb_eIndexError, "index %d out of matches", i);
+}
+
 static int
 match_backref_number(VALUE match, VALUE backref)
 {
@@ -1217,8 +1224,7 @@ match_offset(VALUE match, VALUE n) https://github.com/ruby/ruby/blob/trunk/re.c#L1224
     struct re_registers *regs = RMATCH_REGS(match);
 
     match_check(match);
-    if (i < 0 || regs->num_regs <= i)
-	rb_raise(rb_eIndexError, "index %d out of matches", i);
+    backref_number_check(regs, i);
 
     if (BEG(i) < 0)
 	return rb_assoc_new(Qnil, Qnil);
@@ -1253,8 +1259,7 @@ match_begin(VALUE match, VALUE n) https://github.com/ruby/ruby/blob/trunk/re.c#L1259
     struct re_registers *regs = RMATCH_REGS(match);
 
     match_check(match);
-    if (i < 0 || regs->num_regs <= i)
-	rb_raise(rb_eIndexError, "index %d out of matches", i);
+    backref_number_check(regs, i);
 
     if (BEG(i) < 0)
 	return Qnil;
@@ -1288,8 +1293,7 @@ match_end(VALUE match, VALUE n) https://github.com/ruby/ruby/blob/trunk/re.c#L1293
     struct re_registers *regs = RMATCH_REGS(match);
 
     match_check(match);
-    if (i < 0 || regs->num_regs <= i)
-	rb_raise(rb_eIndexError, "index %d out of matches", i);
+    backref_number_check(regs, i);
 
     if (BEG(i) < 0)
 	return Qnil;
-- 
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