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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 5"""
+ date="2017-02-03T19:32:58Z"
+ content="""
+What you're looking for is not a regexp, but Haskell's [pattern
+matching](https://www.haskell.org/tutorial/patterns.html).
+
+For example:
+
+ myproperty :: Property Debian
+ myproperty = withOS "some desc here" $ \w o -> case o of
+ -- Pattern match on the OS, to get the Debian stable release
+ (Just (System (Debian _kernel (Stable release)) _arch)) ->
+ ensureProperty w $ Apt.setSourcesListD (sourcesLines release) "mysources"
+ _ -> unsupportedOS
+
+ sourcesLines :: Release -> [Line]
+ sourcesLines release = undefined
+"""]]