| --- Log opened Thu Sep 18 00:00:27 2014 |
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| 01:26 | <@macdjord> | https://i.imgur.com/Yv5Cmn1.png Now, I'd add a line saying 'total_hours_spent_enjoyably_puzzling_over_this_intersting_problem = ...' |
| 01:32 | <&McMartin> | https://i.imgur.com/DxZAsU4.png |
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| 02:07 | <@macdjord> | https://www.youtube.com/watch?v=3San3uKKHgg |
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| 10:49 | <@Tarinaky> | So \d is a regexp for a digit... |
| 10:49 | <@Tarinaky> | However I need to match a real... |
| 10:56 | <@gnolam> | In which locale? |
| 10:57 | <@Tarinaky> | I have no idea. |
| 10:58 | <@Tarinaky> | I'm currently using /(\d+\.?\d*e?[\+-]?\d*)/ |
| 10:58 | <@Tarinaky> | Noting that said real is strictly positive. |
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| 11:09 | <@Tarinaky> | Also, this website is neat: http://regexpal.com/ |
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| 11:31 | <@RchrdB> | Tarinaky, you regexp matches "1." and "1.e" and "1.e+" and "1.+0" |
| 11:32 | <@RchrdB> | for matching a floating-point number, I'd use /(\d+(.\d+)?(e[+-]?\d+)?/ |
| 11:32 | <@TheWatcher> | Which is wrong, because it's allow 1a3 |
| 11:32 | <@TheWatcher> | (escape the \. ;)) |
| 11:33 | <@RchrdB> | Whups, ta. |
| 11:33 | <@RchrdB> | *ahem* /(\d+(\.\d+)?(e[+-]?\d+)?/ |
| 11:33 | <@TheWatcher> | Also, might want to use non-capturing clustering, depending on the setup, so (?:\.\d+)?etc |
| 11:35 | <@Azash> | http://i.imgur.com/bhmw96Yl.jpg |
| 11:36 | <@TheWatcher> | ... |
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| 11:41 | <@Tarinaky> | I'm not sure having a regexp be slightly /too/ permissive is a bad thing as the thing it's matching produces saner error messages. |
| 11:41 | <@Tarinaky> | *it's matching for |
| 11:42 | <@Tarinaky> | It's the old joke about hiring a team of engineers to come up with a regexp to match valid email addresses... vs using a regexp that accepts anything that looks like an email address and verifying it by sending an email. |
| 11:44 | <@Azash> | Is that joke supposed to imply the second one is a good solution? |
| 11:45 | <@gnolam> | "Old joke" what |
| 11:45 | <@gnolam> | Azash: the second one is the only decent solution. |
| 11:45 | <@gnolam> | But this is the first thing I've heard about any jocularity in the situation. |
| 11:47 | <@TheWatcher> | There is no decent solution with email |
| 11:47 | <@TheWatcher> | there is only madness and pain |
| 11:47 | <@Tarinaky> | It's a joke, because I don't do web programming and get to laugh at you going insane. |
| 11:48 | <@Azash> | This is closer to how I interpret that choice |
| 11:48 | | * Azash cheers for back-end development |
| 11:48 | <@Tarinaky> | Schadenfreude (sp?) |
| 11:48 | <@Azash> | I mean if you want to go by the "don't validate, try" approach |
| 11:49 | <@Azash> | I would rather suggest that you split it up, make sure the part before the @ is valid, and then try to dig the part after it |
| 11:49 | <@Azash> | That seems better than sending "HELLO ARE YOU THERE?" emails |
| 11:49 | <@gnolam> | No, no, no. Then you'll invariably do something idiotic like discarding addresses with pluses in them. |
| 11:49 | <@Tarinaky> | Azash: Except you have to go right to left. |
| 11:50 | <@Tarinaky> | It's permissible to have an email address Joe@Blogs@Server |
| 11:50 | <@Azash> | What |
| 11:50 | | * TheWatcher refers the honourable gent to his previous note, re: madness and pain |
| 11:50 | <@Tarinaky> | I might be wrong though. It's obscure. |
| 11:50 | <@Azash> | Oh yeah actually I think I've seen those in relation to corporate gmail or something |
| 11:51 | <@Tarinaky> | Actually, is there a sensible way of doing right-to-left regexp now I think about it? |
| 11:51 | | * gnolam posts https://www.youtube.com/watch?v=JENdgiAPD6c here for like the gazillionth time |
| 11:51 | <@Tarinaky> | It still counts as a regular language right? Since we're still doing 1 token at a time... just backwards. |
| 11:52 | <@gnolam> | (A talk about email and why it hates you and wants you to be unhappy) |
| 11:52 | <@Tarinaky> | It could be worse. |
| 11:52 | <@Tarinaky> | It could be time. |
| 11:52 | <@TheWatcher> | (and, if anything, he understates the problem) |
| 11:52 | <@Azash> | Tarinaky: Yes it should be possible |
| 11:52 | <@Azash> | Like all good thoughts begin, so does this |
| 11:52 | <@Azash> | Presume an NDFA.. |
| 11:53 | <@Tarinaky> | Is there a sensible way of doing it though? |
| 11:53 | <@TheWatcher> | Tarinaky: if all else fails? Reverse the string first and parse forward. |
| 11:53 | <@Tarinaky> | I'd presume writing your regexp backwards and reversing the input string is silly. |
| 11:53 | <@Azash> | Anyway, take the set consisting of the starting node and all nodes that are a null transition from it, and label those accepting nodes |
| 11:53 | <@Tarinaky> | Or at least, even less human readible than a normal regexp |
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| 11:54 | <@Azash> | Take the set of formerly accepting nodes and instead put them in a null transition from a new node which is the starting node |
| 11:54 | <@Azash> | And reverse all directions |
| 11:54 | <@Tarinaky> | TheWatcher: Regexps are hard enough to write front to back though... can you write the regexp forwards and reverse it programaticall? |
| 11:54 | <@Tarinaky> | *programaticallu |
| 11:55 | <@TheWatcher> | Uh |
| 11:56 | <@TheWatcher> | All you're doing is making sure a string has specific things at specific places, and possibly capturing parts of it |
| 11:57 | <@TheWatcher> | so if you're checking a string that has been reversed, you just need to write the regexp to allow for that |
| 11:57 | <@TheWatcher> | You don't write it forwards and then reverse the regex, you just write it for the different string form |
| 11:58 | <@Tarinaky> | /hyperbolic/ is easier to write than /cilobrepyh/ |
| 11:58 | <@TheWatcher> | (but this is actually kinda moot, as it is quite possible to write a regex to do things like, say, anchor on the last @ and then check the remainder) |
| 11:59 | <@Tarinaky> | (it was a moot point to begin with~) |
| 11:59 | <@Tarinaky> | (I just have a weird mind) |
| 11:59 | <@TheWatcher> | (Ruby will do that to a person~) |
| 11:59 | <@Tarinaky> | (touche~) |
| 12:04 | <@Azash> | Ruby breaks your mind by being a pleasant experience |
| 12:04 | <@Azash> | Rather that than python, at least ( ââ¿â) |
| 12:06 | <@Tarinaky> | I disagree. |
| 12:06 | <@Tarinaky> | It's impossible to remember all the bits of syntax. |
| 12:06 | <@Azash> | You are fully entitled to |
| 12:06 | <@Tarinaky> | Also, programming shouldn't be too easy otherwise other people will think they can do it :P |
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| 12:12 | <@Tarinaky> | It's not terrible to use Ruby though. |
| 12:13 | <@Tarinaky> | I've used worse |
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| 12:50 | <@Tarinaky> | I need a quick and dirty way to tell me/verify what the frequency of a sine wave is. |
| 12:50 | <@Tarinaky> | I just searched github for guitar tuners... but I'm not getting anything useful. |
| 12:52 | <@RchrdB> | run it through an FFT function, look at where the biggest peak is. |
| 13:08 | <@Tarinaky> | I don't have one of those to hand... |
| 13:08 | <@Tarinaky> | Presumably there is a piece of software I can execute to do this... |
| 13:13 | <@Tarinaky> | Ahah, found some trial software called Sigview. |
| 13:14 | <@Tarinaky> | Yeah, that's what I thought. Right note - wrong octave |
| 13:17 | <@RchrdB> | numpy/scipy has one, but I don't know offhand how to interpret the result, so does matlab :) |
| 13:18 | <@RchrdB> | (you've already solved it, I was just thinking of where the nearest FFT is to hand right now for me) |
| 13:20 | <@Tarinaky> | Let me know if you figure out some numpy magic |
| 13:20 | <@Tarinaky> | I'm sure I'll need it again |
| 13:20 | <@Tarinaky> | And my solution sucked |
| 13:21 | <@RchrdB> | fair |
| 13:33 | <@Tarinaky> | Hunh. I managed to kill the hardware on my pi. |
| 13:33 | <@Tarinaky> | At least, temporarily. |
| 13:33 | | * Tarinaky re-runs tests. |
| 15:48 | | * Tarinaky head-desks at her terrible, terrible, C. |
| 16:02 | < Syka> | heh |
| 16:11 | <@RchrdB> | Pick up Rust once it gets to 1.0? |
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| 16:38 | <@Tarinaky> | Turns out I just spent the entire day banging my head against something that's out of my control and is nothing to do with my terrible C |
| 16:38 | <@Tarinaky> | Goodie. |
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| 17:25 | < [R]> | What was that T? |
| 17:27 | <@Tarinaky> | Can't say. I'd have to kill ya |
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| --- Log closed Fri Sep 19 00:00:43 2014 |