From 674e2ca9452121a3e3066e04ecd51ba8d863cf2b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 5 Oct 2025 12:59:52 +0900
Subject: [ruby/pp] Reduce substring creations

https://github.com/ruby/pp/commit/fee2d39099
---
 lib/pp.rb | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/pp.rb b/lib/pp.rb
index 2c7f41eadd..e790f499d4 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -313,12 +313,10 @@ class PP < PrettyPrint
       # A pretty print for a pair of Hash
       def pp_hash_pair(k, v)
         if Symbol === k
-          sym_s = k.inspect
-          if sym_s[1].match?(/["$@!]/) || sym_s[-1].match?(/[%&*+\-\/<=>@\]^`|~]/)
-            text "#{k.to_s.inspect}:"
-          else
-            text "#{k}:"
+          if k.inspect.match?(%r[\A:["$@!]|[%&*+\-\/<=>@\]^`|~]\z])
+            k = k.to_s.inspect
           end
+          text "#{k}:"
         else
           pp k
           text ' '
-- 
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