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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > YOSPOS > Linux: vim isn't moe
 
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qntm
Jun 17, 2009

Sudo Echo posted:

At over 23k, the current email regexp is getting pretty big. That doesn't include the nested comment
stripping, which adds just over 1k, or the domain literal (IPv4 & IPv6) rules, which add another 1k.

It's a testament to PCRE that it even runs.


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))?(?:\x28(?:(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+
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0d\x0a)[\x20\x09]+)*))?(?:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|[\x21-\x27\x2A-\x5b\x5d-\x7e])|(?:\x5c
(?:\x0a*\x0d*[\x00-\x09\x0b\x0c\x0e-\x7f]\x0a*\x0d*)|(?:\x5c[\x00-\x7f]))))*(?:(?:(?:[\x20\x09]*(?:\
x0d\x0a))?[\x20\x09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))?\x29)|(?:(?:(?:[\x20\x09]*(?:\x0
d\x0a))?[\x20\x09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))))?))*)))


And for nested comments:

(?:\x28(?:(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*)
)?(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|[\x21-\x27\x2A-\x5b\x5d-\x7e])|(?:\x5c(?:\x0a*\x0d*[\x00-\x09\
x0b\x0c\x0e-\x7f]\x0a*\x0d*)|(?:\x5c[\x00-\x7f])))*(?:(?:(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x09
]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))?(?:\x28(?:(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x
09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))?(?:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|[\x21-\x27
\x2A-\x5b\x5d-\x7e])|(?:\x5c(?:\x0a*\x0d*[\x00-\x09\x0b\x0c\x0e-\x7f]\x0a*\x0d*)|(?:\x5c[\x00-\x7f])
)))*(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))?\x29
))(?:(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x09]+)|(?:[\x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))?(?:
[\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|[\x21-\x27\x2A-\x5b\x5d-\x7e])|(?:\x5c(?:\x0a*\x0d*[\x00-\x09\x0b\x
0c\x0e-\x7f]\x0a*\x0d*)|(?:\x5c[\x00-\x7f])))*)+(?:(?:(?:[\x20\x09]*(?:\x0d\x0a))?[\x20\x09]+)|(?:[\
x20\x09]+(?:(?:\x0d\x0a)[\x20\x09]+)*))?\x29)


And domain-literal IP addresses:

[(?:(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3}))|(?:IPv6\:(?:[0-9a-fA-F]{1,4})(?:\:(?:[0-9a-fA-F]{1,4
})){7})|(?:IPv6\:((?:(?:[0-9a-fA-F]{1,4})(?:\:(?:[0-9a-fA-F]{1,4})){0,7})?\:\:(?:(?:[0-9a-fA-F]{1,4}
)(?:\:(?:[0-9a-fA-F]{1,4})){0,7})?))|(?:IPv6\:(?:[0-9a-fA-F]{1,4})(?:\:(?:[0-9a-fA-F]{1,4})){5}\:(\d
{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3}))|(?:IPv6\:((?:(?:[0-9a-fA-F]{1,4})(?:\:(?:[0-9a-fA-F]{1,4}))
{0,5})?\:\:(?:(?:[0-9a-fA-F]{1,4})(?:\:(?:[0-9a-fA-F]{1,4})){0,5}\:)?)(\d{1,3})\.(\d{1,3})\.(\d{1,3}
)\.(\d{1,3}))]


The full regexp for RFC2822 addresses was a mere 3.7k.

these are strictly regular, they should be child's play for any regex engine

they're obviously not human-readable but the process of assembling them from smaller patterns is extremely straightforward, if that matters

although there are unnecessary parens all over the place

* # ¿ Sep 25, 2014 13:21
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# ¿ Apr 26, 2024 05:44
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qntm
Jun 17, 2009
 regular expressions are rad

* # ¿ Sep 25, 2014 17:49
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qntm
Jun 17, 2009

Cybernetic Vermin posted:

strict regularity or simple composition is no guarantee whatsoever that a regex runs well, and deciding whether a regex can catastrophically backtrack is pretty drat hard

deciding whether a "regex" is strictly regular or not is trivial. so is running a strictly regular expression in linear time.

I mean, in theory. I know there are some regex engines which fail to do this (perl)

* # ¿ Sep 29, 2014 17:07
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qntm
Jun 17, 2009

Notorious b.s.d. posted:

historically linux has required gobs more RAM than windows, back when RAM was expensive.

oh so that's why linux always demanded a swap partition? i could never work that out

* # ¿ Oct 26, 2014 12:00
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qntm
Jun 17, 2009

Ericadia posted:

is that true to this day? (srs) i always read from nerds how they use linux for minimal systems. Has linux become efficient or are these nerds just idiots?

I haven't tried to install linux in years, but I seem to recall at the time asking my install-linux-advocate friend "what is this swap partition thing it's asking for" and him explaining that linux needs that as somewhere to put stuff that won't fit in RAM, and I don't remember asking the obvious question "why does linux need that, windows never did" but I imagine the reply would have been a hurriedly changed subject

* # ¿ Oct 26, 2014 12:10
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qntm
Jun 17, 2009

pram posted:

if you hit max memory without swap the oom killer will just start blowing up potentially important stuff

what happens if you run out of memory and also run out of swap

* # ¿ Oct 27, 2014 00:26
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qntm
Jun 17, 2009

carry on then posted:

http://www.freedesktop.org/wiki/Software/systemd/


aaaaaaaaaaaaaaaaaaaaaaaaaaaa

"cache invalidation and naming things"

* # ¿ Nov 17, 2014 19:32
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qntm
Jun 17, 2009
 so is it just "deb" now

* # ¿ Nov 19, 2014 20:36
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qntm
Jun 17, 2009

ruby idiot railed posted:

i for one am glad to see people admit that os x is a linux on the desktop

shaggar vindicated again

this is actually why a friend of mine prefers macs

* # ¿ Dec 5, 2014 22:20
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qntm
Jun 17, 2009

pram posted:

hp already makes arm blades

I never asked for this

* # ¿ Jan 2, 2015 23:37
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# ¿ Apr 26, 2024 05:44
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qntm
Jun 17, 2009

Suspicious Dish posted:

Only after Valve canceled their contract with Canonical and switched to Collabora. If you look at some of the package sources, you'll see @canonical.com in the changelogs, until suddenly you start seeing @collabora.com instead.

whoah, collabora was founded by a friend of mine from university

that's the first time I've seen their name come up externally

* # ¿ Jan 13, 2015 22:28
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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > YOSPOS > Linux: vim isn't moe