From c01a5ee85e2d6a7128cccafb143bfa694284ca87 Mon Sep 17 00:00:00 2001
From: kazu <kazu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 4 Dec 2018 08:22:10 +0000
Subject: Use delete_prefix instead of `sub(/\Afixed-pattern/, '')`

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/cgi/core.rb     | 4 ++--
 lib/mkmf.rb         | 2 +-
 lib/net/protocol.rb | 2 +-
 lib/optparse.rb     | 2 +-
 lib/un.rb           | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

(limited to 'lib')

diff --git a/lib/cgi/core.rb b/lib/cgi/core.rb
index 3fb8dbab54..c45f9b3a9e 100644
--- a/lib/cgi/core.rb
+++ b/lib/cgi/core.rb
@@ -421,7 +421,7 @@ class CGI
   module QueryExtension
 
     %w[ CONTENT_LENGTH SERVER_PORT ].each do |env|
-      define_method(env.sub(/^HTTP_/, '').downcase) do
+      define_method(env.delete_prefix('HTTP_').downcase) do
         (val = env_table[env]) && Integer(val)
       end
     end
@@ -434,7 +434,7 @@ class CGI
         HTTP_ACCEPT HTTP_ACCEPT_CHARSET HTTP_ACCEPT_ENCODING
         HTTP_ACCEPT_LANGUAGE HTTP_CACHE_CONTROL HTTP_FROM HTTP_HOST
         HTTP_NEGOTIATE HTTP_PRAGMA HTTP_REFERER HTTP_USER_AGENT ].each do |env|
-      define_method(env.sub(/^HTTP_/, '').downcase) do
+      define_method(env.delete_prefix('HTTP_').downcase) do
         env_table[env]
       end
     end
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 355ea171ee..0d9d3d9f38 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2264,7 +2264,7 @@ RULES
     origdef ||= ''
 
     if $extout and $INSTALLFILES
-      $cleanfiles.concat($INSTALLFILES.collect {|files, dir|File.join(dir, files.sub(/\A\.\//, ''))})
+      $cleanfiles.concat($INSTALLFILES.collect {|files, dir|File.join(dir, files.delete_prefix('./'))})
       $distcleandirs.concat($INSTALLFILES.collect {|files, dir| dir})
     end
 
diff --git a/lib/net/protocol.rb b/lib/net/protocol.rb
index 037fcd8358..71378af804 100644
--- a/lib/net/protocol.rb
+++ b/lib/net/protocol.rb
@@ -311,7 +311,7 @@ module Net # :nodoc:
       read_bytes = 0
       while (line = readuntil("\r\n")) != ".\r\n"
         read_bytes += line.size
-        yield line.sub(/\A\./, '')
+        yield line.delete_prefix('.')
       end
       LOG_on()
       LOG "read message (#{read_bytes} bytes)"
diff --git a/lib/optparse.rb b/lib/optparse.rb
index c6e652971e..5cdcabf4a7 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -1595,7 +1595,7 @@ XXX
               begin
                 sw, = complete(:short, opt)
                 # short option matched.
-                val = arg.sub(/\A-/, '')
+                val = arg.delete_prefix('-')
                 has_arg = true
               rescue InvalidOption
                 # if no short options match, try completion with long
diff --git a/lib/un.rb b/lib/un.rb
index d109a3417b..14f5b10fec 100644
--- a/lib/un.rb
+++ b/lib/un.rb
@@ -47,7 +47,7 @@ def setup(options = "", *long_options)
     end
     long_options.each do |s|
       opt_name, arg_name = s.split(/(?=[\s=])/, 2)
-      opt_name.sub!(/\A--/, '')
+      opt_name.delete_prefix!('--')
       s = "--#{opt_name.gsub(/([A-Z]+|[a-z])([A-Z])/, '\1-\2').downcase}#{arg_name}"
       puts "#{opt_name}=>#{s}" if $DEBUG
       opt_name = opt_name.intern
-- 
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