If you call Regex.compile, then you are passing a string which means \w must now be \\w. If you just pass \w, you can see how it becomes simply w, because \ was discarded by the *string* and never made to the regex compile.
Since \d represents the delete escape character, it becomes the codepoint 007F before it ever enters the regex and so the regex needs to escape it using \x to avoid ambiguity with its own \d, so not a bug. :) On Monday, June 6, 2016, Onorio Catenacci <[email protected]> wrote: > Yeah I think you've hit on the problem Johnny. It does appear the \d is > the issue. > > iex(10)> {:ok, rc} = Regex.compile("\d") > {:ok, ~r/\x7F/} > iex(11)> {:ok, rc} = Regex.compile("\w") > {:ok, ~r/w/} > > As I say, I can certainly do this without having to compile the regex but > it sure looks like a bug (albeit a minor one as far as I can tell). > > -- > Onorio > > > On Mon, Jun 6, 2016 at 2:37 PM, Johnny Winn <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: > >> This would be a bug from what I can see. the `\` seems to be giving >> `Regex.compile/1` a fit. >> >> On a mac, Elixir 1.2.5: >> >> iex(1)> {:ok, rc} = Regex.compile("(?<version>\d+.\d+.\d+.\d+)*$") >> {:ok, ~r/(?<version>\x7F+.\x7F+.\x7F+.\x7F+)*$/} >> iex(2)> {:ok, rc} = Regex.compile("(?<version>\d+.\w+.\w+.\w+)*$") >> {:ok, ~r/(?<version>\x7F+.w+.w+.w+)*$/} >> >> If Jose is ok with you submitting the bug, I can take a look at it :) >> >> ~ Johnny >> >> On Mon, Jun 6, 2016 at 2:28 PM, Onorio Catenacci <[email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: >> >>> Hi all, >>> >>> Not sure if this is a bug or simply me misunderstanding the mechanism of >>> regex's. I hope no one minds me asking about this here so I don't file a >>> bug if it's just a misunderstanding on my part. >>> >>> On Windows 10 with Elixir 1.2.6, I've been working on a regex to pull >>> the version portion of a string. This works: >>> >>> iex(4)> v = >>> Regex.named_captures(~r/(?<version>\d+.\d+.\d+.\d+)*$/,"Version=15.0.4815.1002") >>> %{"version" => "15.0.4815.1002"} >>> iex(5)> v >>> %{"version" => "15.0.4815.1002"} >>> iex(6)> v["version"] >>> "15.0.4815.1002" >>> >>> But as I was playing with the regex, I found this which struck me as >>> sort of curious: >>> >>> iex(7)> {:ok, rc} = Regex.compile("(?<version>\d+.\d+.\d+.\d+)*$") >>> {:ok, ~r/(?<version>\x7F+.\x7F+.\x7F+.\x7F+)*$/} >>> iex(8)> rc >>> ~r/(?<version>\x7F+.\x7F+.\x7F+.\x7F+)*$/ >>> >>> Which when I try with named_captures gives me this: >>> >>> iex(9)> v = Regex.named_captures(rc,"Version=15.0.4815.1002") >>> %{"version" => ""} >>> >>> Knowing this is Windows 10 and knowing the issues we've had with unicode >>> over the years, I ran chcp 65001. The problem still occurs. It's a minor >>> issue because as you can see, I've got a working regex. >>> >>> So am I misunderstanding something or is this a bug? Any advice would >>> be appreciated. >>> >>> -- >>> Onorio >>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "elixir-lang-core" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected] >>> <javascript:_e(%7B%7D,'cvml','elixir-lang-core%[email protected]');> >>> . >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/elixir-lang-core/d921ceaf-de00-4137-ac6e-dc11209d3db8%40googlegroups.com >>> <https://groups.google.com/d/msgid/elixir-lang-core/d921ceaf-de00-4137-ac6e-dc11209d3db8%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "elixir-lang-core" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/elixir-lang-core/7KxqS9FW5vw/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> [email protected] >> <javascript:_e(%7B%7D,'cvml','elixir-lang-core%[email protected]');> >> . >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/elixir-lang-core/CALBtUW6aTpPG3rNsmNEzCdxvtwyyfQVhANYvdpvORF%2Bb7XCqCw%40mail.gmail.com >> <https://groups.google.com/d/msgid/elixir-lang-core/CALBtUW6aTpPG3rNsmNEzCdxvtwyyfQVhANYvdpvORF%2Bb7XCqCw%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Onorio Catenacci > > http://onor.io > http://www.google.com/+OnorioCatenacci > > -- > You received this message because you are subscribed to the Google Groups > "elixir-lang-core" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <javascript:_e(%7B%7D,'cvml','elixir-lang-core%[email protected]');> > . > To view this discussion on the web visit > https://groups.google.com/d/msgid/elixir-lang-core/CAP%3DvNq8KzoK_hBq8RxyOUEUSUCaWUcN6kifMGAvfRidQ2AZPdg%40mail.gmail.com > <https://groups.google.com/d/msgid/elixir-lang-core/CAP%3DvNq8KzoK_hBq8RxyOUEUSUCaWUcN6kifMGAvfRidQ2AZPdg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- *José Valim* www.plataformatec.com.br Skype: jv.ptec Founder and Director of R&D -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. 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