The Nineteenth Byte

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Chris Jester-Young

22:07

@GeorgeEdison \o/

George Edison

...and that one includes the fix for the links when sorting by code size problem.

Chris Jester-Young

Yay!

George Edison

22:23

Any RegEx people around?

I've got a really confusing one.

/^(?<!#.+)\r$/gs

I know, I know... it looks like Perl...

Nemo157

From www.myregextester.com:
Match Pattern Explanation:
MATCH PATTERN ERROR.

What are you trying to do?

George Edison

It's bad, I know...

Where does that come from?

George Edison

...I'm trying to match lines that don't start with '#'

...but I think I've got it.

Remove that <

George Edison

22:29

/^(?!#).+$/gs

^--- That works.

...sort of.

I need to match the newline is what I really need.

match or capture?

George Edison

Just match.

I don't need anything captured.

I must be missing context--why the /gs?

George Edison

Oh, never mind that.

That's not part of the RegEx itself.

(That's what wraps the expression in JavaScript.)

Here is what I have now: ^(?!#.+)$\r

I just want to match the newline.

Chris Jester-Young

I gotta go really shortly, but I do know regex and I can help you when I get back.

Nabb

22:34

Can't you just use /\n/?

errr

George Edison

Ya, but it should only match newlines that end a line that didn't start with a '#'

the fine art of asking questions :)

Kent Fredric

@GeorgeEdison Yummy. I know (most) regex. And Perl. I may be of some use.

you're going to need a literal "\n"

because "." by default won't match a newline.

that /s tends to make me think otherwise, but he won't admit it's there

Kent Fredric

I don't think javascript has /s does it?

22:41

dunno

Juan

Nope, javascript has no modifier s for regex

just /gim in the page I found

George Edison

I'm confused.

Q: RegEx to match only a newline character with given conditions?

I have the following RegEx: ^(?!#)(?<=.+)$\r (with the global and multiline flags set) What I want to do is match a newline only when it ends a line that doesn't start with '#'.

Kent Fredric

You can't just say "regex" , there's multiple flavours >_>

you have to specifiy "JavaScript" in your question if you want it to work in Javascript.

George Edison

Well, then we'll say PECL for now.

...or JavaScript, yeah.

There, I retagged the question.

Kent Fredric

22:52

jsfiddle.net/kentnl/aLPNQ

/(^#.*\n)/mg; # the basics of what is needed.

George Edison

@Kent: Thanks!

Kent Fredric

that other stuff you're doing looks needlessly fancy.

George Edison

P.S., if you need a good testing tool for RegEx, I humbly recommend RegExr.

That's what I'm using for testing this all out.

Kent Fredric

For regex testing, I just put the regex in the code and run it =P

George Edison

Whatever works.

Kent Fredric

22:55

In your case, its list of stuff and various regex tricks to drop in seem to be confusing =P

Lookbehind/Lookahead are generally "non-capturing"

Kent Fredric

23:07

@GeorgeEdison jsfiddle.net/kentnl/aLPNQ/1 # I believe this is what you are trying to do

Javascript Regex Doesn't support "lookbehind", so you'll need to use capturing in the subsitution.

George Edison

@Kent: Thanks... but I kind of wanted the opposite.

I want to replace the newlines on all lines except for the lines that start with '#'.

Kent Fredric

you just want to eleminate comment lines? =)

oh. right.

/me ponders

George Edison

The sample in this case is C++ code.

I want to 'minify' it but I can't get rid of newlines if that line is a preprocessor block.

...and they start with '#'.

The guy who wrote a comment here had a great idea...

> "I'd be tempted to .split on newline, iterate through the array and add a newline to anything not starting with # and then .join"

Chris Jester-Young

@GeorgeEdison Use a real parser, rather than regexes. :-P

Juan

That's just crazy talk

Kent Fredric

23:19

jsfiddle.net/kentnl/aLPNQ/2 # theres a start :/

you can't just split on newline, because splitting wont capture the terminator.

Well, I guess you can, its just different >_>

but you have to become jquerysexual to use ^ that code.

George Edison

jQuery.map()... I like that.

George Edison

23:57

I found a jQuery bug!

Kent Fredric

lies!

Juan

And I was just starting to respect you...

Kent Fredric

George Edison

jsfiddle.net/george_edison/EVBtj

See for yourself.

It actually yanks off a linebreak after the first line.

Kent Fredric

I don't see how thats a bug.

George Edison

23:59

It's not supposed to remove line breaks halfway through the string.

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