Date: Tue, 9 Feb 2010 16:47:56 -0800 From: Garrett Cooper <yanefbsd@gmail.com> To: David Wolfskill <david@catwhisker.org> Cc: hackers@freebsd.org Subject: Re: sysctl with regex? Message-ID: <6A6276EA-27D4-4BC2-A4A9-EFF190D3EB10@gmail.com> In-Reply-To: <20100210001937.GU391@bunrab.catwhisker.org> References: <d41814901002091308s7e894b55p880bde165bbbe703@mail.gmail.com> <86tytqvwky.fsf@ds4.des.no> <d41814901002091528i4884987cmb7347dfe4d50bdc5@mail.gmail.com> <26049703-8844-4476-B277-776A4EFC0A53@gmail.com> <20100210001937.GU391@bunrab.catwhisker.org>
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On Feb 9, 2010, at 4:19 PM, David Wolfskill wrote: > On Tue, Feb 09, 2010 at 04:14:12PM -0800, Garrett Cooper wrote: >> ... >> I'll see if I can whip up a quick patch in the next day or so -- = but before I do that, does it make more sense to do globs or regular = expressions? There are pluses and minuses to each version and would = require some degree of parsing (and potentially escaping). >> ... >=20 > I believe it's easier to be precise about exactly what is wanted with = a > regex (vs. a glob). >=20 > On the other hand, globs tend to be "quick & dirty" (in my = experience). ;-} Your doppleganger's Andrew :o? Regexps have a certain degree of ambiguity with them, as the = following is a valid regexp: sysctl dev\.cpu\..*\.temperature Assuming the correct periods are escaped, this would be a minor = bug-prone task to complete. Whereas this form will return different results from what you = want most likely (note the subtle difference with the extra period): sysctl dev\.cpu.*\.temperature Globs in this case don't buy you that much difference for what = you want, and (IMO) add unnecessary complexity to the problem as you can = still apply basic character classes, et all. Thanks, -Garrett=
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