p-lang thread: (now (have you (problems two)))

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salted hash browns: Mar 26, 2007; ykrop

man 2007 ya'll old

# ? Oct 18, 2012 23:31

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# ? Jun 11, 2024 19:44

Rufus Ping: Dec 27, 2006; I'm a Friend of Rodney Nano

java 7 added support for named groups in regexes e.g.

(?<foo>\w+)(?<bar>\d+)

is there some way to get the names of all the groups from a Matcher object if i dont know them in advance?

(like how i can get all the values of the groups by calling group(i) for 0<i<=groupCount() )

# ? Oct 19, 2012 02:34

Rufus Ping: Dec 27, 2006; I'm a Friend of Rodney Nano

i mean preferably without doing somematcher.pattern.toString() and using... a regex... to find chevron-enclosed names lol

# ? Oct 19, 2012 03:00

wins32767: Mar 16, 2007

Milkie Galore posted:

i mean preferably without doing somematcher.pattern.toString() and using... a regex... to find chevron-enclosed names lol

This is the one true way.

# ? Oct 19, 2012 03:21

vapid cutlery

Apr 17, 2007

php:

<?
"it's george costanza" ?>

Milkie Galore posted:

i mean preferably without doing somematcher.pattern.toString() and using... a regex... to find chevron-enclosed names lol

that's how stargate did it

# ? Oct 19, 2012 03:28

Shaggar: Apr 26, 2006

Milkie Galore posted:

java 7 added support for named groups in regexes e.g.

(?<foo>\w+)(?<bar>\d+)

is there some way to get the names of all the groups from a Matcher object if i dont know them in advance?

(like how i can get all the values of the groups by calling group(i) for 0<i<=groupCount() )

java regex protip. group(0) always refers to the entire matched string. group(1) is the first one, and the last one is groupcount()+1. its loving stupid but thats the way it works.

as far as names go, i dont see any way to get the name if you have the index. you'll have to regex the regex. altho maybe theres a commons lib that adds that functionality 4 u

# ? Oct 19, 2012 03:32

Shaggar: Apr 26, 2006

tbh theres probably a way better way to do what u want tho.

# ? Oct 19, 2012 03:40

Shaggar: Apr 26, 2006

dynamic regex group naming smells of p-language hackery.

# ? Oct 19, 2012 03:43

Meiwaku: Jan 10, 2011; Fun for the whole family!

Shaggar posted:

regex group naming smells

# ? Oct 19, 2012 03:45

vapid cutlery

Apr 17, 2007

php:

<?
"it's george costanza" ?>

basically anything that's not compile-time checked like using strings for poo poo is the worst

# ? Oct 19, 2012 03:48

vapid cutlery

Apr 17, 2007

php:

<?
"it's george costanza" ?>

i hope you're at least burying this regex inside some class with a simple external API

# ? Oct 19, 2012 03:49

Rufus Ping: Dec 27, 2006; I'm a Friend of Rodney Nano

Shaggar posted:

java regex protip. group(0) always refers to the entire matched string. group(1) is the first one, and the last one is groupcount()+1. its loving stupid but thats the way it works.

the last one is groupcount(), note that i used <= not <

Shaggar posted:

tbh theres probably a way better way to do what u want tho.

dynamic regex group naming smells of p-language hackery.

i dont think there really is unfortunately, other than insisting the user uses numbers rather than names

vapid cutlery posted:

basically anything that's not compile-time checked like using strings for poo poo is the worst

i hope you're at least burying this regex inside some class with a simple external API

yeah as best i can/need to. its a peculiar one, its user-supplied but at compile time (its part of a parser generator)

# ? Oct 19, 2012 03:56

homercles: Feb 14, 2010

You have to cheat:

code:

import java.util.regex.Pattern;
import java.util.Map;
import java.lang.reflect.Method;
import java.lang.reflect.AccessibleObject;

class RegexTest {
  @SuppressWarnings("unchecked")
  public static void main(String[] args) throws Exception {
    Pattern p = Pattern.compile("(?<foo>\\w+)(?<bar>\\d+)");
    // Map<String, Integer> florp = p.namedGroups();

    Method m = Pattern.class.getDeclaredMethod("namedGroups");
    m.setAccessible(true);
    Map<String, Integer> florp = (Map<String, Integer>) m.invoke(p);
    for (String s: florp.keySet()) {
      System.out.format("%s => %d\n", s, florp.get(s));
    }   
  }
}

# ? Oct 19, 2012 04:06

Shaggar: Apr 26, 2006

lol

# ? Oct 19, 2012 04:07

Rufus Ping: Dec 27, 2006; I'm a Friend of Rodney Nano

ah i saw that private map but didn't know there was a way to get at it, thanks homercles!

# ? Oct 19, 2012 04:08

Rufus Ping: Dec 27, 2006; I'm a Friend of Rodney Nano

also brb throwing up

# ? Oct 19, 2012 04:08

Nomnom Cookie: Aug 30, 2009

Milkie Galore posted:

the last one is groupcount(), note that i used <= not <

i dont think there really is unfortunately, other than insisting the user uses numbers rather than names

yeah as best i can/need to. its a peculiar one, its user-supplied but at compile time (its part of a parser generator)

Using user-supplied regexes opens you to a complexity DoS

# ? Oct 19, 2012 05:03

NeoHentaiMaster: Jul 13, 2004; More well adjusted then you'd think.

Shaggar posted:

tbh theres probably a way better way to do what u want tho.

Write it in Perl.

# ? Oct 19, 2012 08:23

Jonny 290: May 5, 2005; [ASK] me about OS/2 Warp

perl regex is fully sick

# ? Oct 19, 2012 09:48

Max Facetime: Apr 18, 2009

Nomnom Cookie posted:

Using user-supplied regexes opens you to a complexity DoS

more importantly it makes for a nasty api

may I suggest

code:

interface SomeParser {
  SomeParser register(String key, String valueRegex);
  void parse(String content);
  String getValue(String key);
}

which at least limits the nastiness

# ? Oct 19, 2012 10:07

X-BUM-RAIDER-X: May 7, 2008

NeoHentaiMaster posted:

Write it in Perl.

# ? Oct 19, 2012 10:35

Rufus Ping: Dec 27, 2006; I'm a Friend of Rodney Nano

Nomnom Cookie posted:

Using user-supplied regexes opens you to a complexity DoS

yes - though the user in this case is another coder, using [the output of] my code in theirs (think antlr,yacc,sablecc etc) so it doesnt really matter and theyre unlikely to do this to themselves and its not my problem if they do

its not like im running a website where ppl can type an arbitrary regex in a box dont worry

# ? Oct 19, 2012 13:29

homercles: Feb 14, 2010

AAAUUUUUGGGHHHHHHHHHH why aren't you writing this in perl6/c#/ruby/clojure/chicken scheme/delphi/anything but C++/elisp and bind it to ctrl-alt-metal-f-g-6/$MY_FAVOURITE_SHITTY_LANGUAGE

write it in scala tho scala is p.cool and totes not my favourite lovely language

# ? Oct 19, 2012 13:50

homercles: Feb 14, 2010

rotor posted:

guys guys guys

can we just let shaggar be shaggar and get back to talking about how im at a difficult crossroads in my career and am also pretty depressed about the whole thing?

idk maybe you're just getting old

getting older

# ? Oct 19, 2012 13:54

homercles: Feb 14, 2010

carbon date rotor's posts

# ? Oct 19, 2012 13:57

tef: May 30, 2004; -> some l-system crap ->

Nomnom Cookie posted:

Using user-supplied regexes opens you to a complexity DoS

http://code.google.com/p/re2/ :v:

# ? Oct 19, 2012 14:22

Tiny Bug Child: Sep 11, 2004; Avoid Symmetry, Allow Complexity, Introduce Terror

vapid cutlery posted:

basically anything that's ... compile...d ... is the worst

# ? Oct 19, 2012 14:38

tef: May 30, 2004; -> some l-system crap ->

Tiny Bug Child posted:

writing software is just a lot more fun in general when you're working against the user

this is actually quite true.

# ? Oct 19, 2012 22:30

vapid cutlery

Apr 17, 2007

php:

<?
"it's george costanza" ?>

homercles posted:

AAAUUUUUGGGHHHHHHHHHH why aren't you writing this in perl6/c#/ruby/clojure/chicken scheme/delphi/anything but C++/elisp and bind it to ctrl-alt-metal-f-g-6/$MY_FAVOURITE_SHITTY_LANGUAGE

write it in scala tho scala is p.cool and totes not my favourite lovely language

you forgot objective c

# ? Oct 20, 2012 03:06