[ruby-cvs:73289] kazu:r66189 (trunk): Use delete_prefix instead of `sub(/\Afixed-pattern/, '')`

[kazu at ruby-lang.org]

kazu	2018-12-04 17:22:10 +0900 (Tue, 04 Dec 2018)

  New Revision: 66189

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66189

  Log:
    Use delete_prefix instead of `sub(/\Afixed-pattern/, '')`

  Modified files:
    trunk/ext/ripper/lib/ripper/lexer.rb
    trunk/lib/cgi/core.rb
    trunk/lib/mkmf.rb
    trunk/lib/net/protocol.rb
    trunk/lib/optparse.rb
    trunk/lib/un.rb