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@@ -0,0 +1,11 @@
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+#+begin_example
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+echo 'abc :results output :eval no' | sed -E 's#.*(results [[:alnum:]]{1,}).*#\1#'
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+#+end_example
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+
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+This demonstrates the following uses of GNU sed:
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+
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+- Extended regexps :: =-E=
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+- Substitution :: =s#OLD#NEW#=
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+- Character classes :: =[[:alnum:]]=
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+- "bounds" :: ={1,0}= (could be =+=)
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+- replacement :: =s#(FOO)#\1#=
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