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-rw-r--r--lib/cgi/util.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/cgi/util.rb b/lib/cgi/util.rb
index 18eaf44375..464115262f 100644
--- a/lib/cgi/util.rb
+++ b/lib/cgi/util.rb
@@ -11,7 +11,7 @@ module CGI::Util
# # => "%27Stop%21%27+said+Fred"
def escape(string)
encoding = string.encoding
- string.b.gsub(/([^ a-zA-Z0-9_.-]+)/) do |m|
+ string.b.gsub(/([^ a-zA-Z0-9_.\-~]+)/) do |m|
'%' + m.unpack('H2' * m.bytesize).join('%').upcase
end.tr(' ', '+').force_encoding(encoding)
end