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comp.lang.ruby

accessing all matches using regex

spike grobstein

8/6/2007 4:06:00 AM

Hey all

so, I primarily use PERL for creating shell scripts but I'm trying to
learn ruby since it feels like it could do more of what I want with
cleaner code. I especially like the way it has regex built right in.

I'm running into an issue though, because in perl, I can do this:

while (/href=\"([^\"]+)\"/) {
## do stuff...
}

I use this simple regex because it's based around what I use this style
for the most.

I can't figure out how to that in ruby. how can I iterate over all
matches in a string? I could split the lines, but sometimes there may be
two or more matches on a single line.

is there a nice, clean, ruby way to do this?

Thanks!
--
Posted via http://www.ruby-....
6 Answers

Jim Marshall

8/6/2007 4:31:00 AM

0

On 8/5/07, Spike Grobstein <spike666@mac.com> wrote:
> while (/href=\"([^\"]+)\"/) {
> ## do stuff...
> }
> ...
> I can't figure out how to that in ruby. how can I iterate over all
> matches in a string? I could split the lines, but sometimes there may be
> two or more matches on a single line.
>
> is there a nice, clean, ruby way to do this?
>

Have a look at String#scan ("ri String#scan" might do it, depending
upon your installation).
For example,
>some_string_with_html.scan(/href=\"([^\"]+)\"/) do |match|
> do_stuff_with match
>end

Gordon Thiesfeld

8/6/2007 4:33:00 AM

0

> is there a nice, clean, ruby way to do this?

Have a look at String#scan

spike grobstein

8/6/2007 12:24:00 PM

0

david karapetyan wrote:
> look up gsub! for the String class. you can write
>
> some_string.gsub(/href=\"([^\"]+)\"/) do |match|
> ## do stuff with match
> end
>
> i'm pretty sure the above code will work for what you are trying to do.

you know, I thought about String#scan, but for some reason didn't think
it was what I was looking for, but it works sorta nicely. it doesn't
behave exactly how I'd want... but the String#gsub method looks more
like what I'm looking for; this way, I can loop and access my various
$1, $2, etc matches and not have to work with an array that I have to
loop over in a weird way (since I don't use some of matches).

I'll have to play with this a little more.

thanks!
--
Posted via http://www.ruby-....

LibtardFilth

1/25/2011 3:15:00 AM

0


"J. Fartlington Poopnagel" <perryneheum@hotmail.com> wrote in message
news:ed095c9b-ff63-4a86-a3a9-85dacc7e4643@q8g2000prm.googlegroups.com...
> BUT, HYMIE -- OUR JOBLESS ARE NOT ROLLING IN EMPLOYMENT!
>
> WHAT GIVES?

What business in their right mind will hire people unless there's no
alternative. They don't want the unknown expenses associated with employees
until Obammy-care is repealed and/or changed and Cap-N-Tax is totally dead.
Until then, no jobs!


Lamont Cranston

1/25/2011 10:36:00 PM

0

On 1/24/2011 7:14 PM, LibtardFilth wrote:
> "J. Fartlington Poopnagel"<perryneheum@hotmail.com> wrote in message
> news:ed095c9b-ff63-4a86-a3a9-85dacc7e4643@q8g2000prm.googlegroups.com...
>> BUT, HYMIE -- OUR JOBLESS ARE NOT ROLLING IN EMPLOYMENT!
>>
>> WHAT GIVES?
>
> What business in their right mind will hire people unless there's no
> alternative. They don't want the unknown expenses associated with employees
> until Obammy-care is repealed

It won't be.

> and/or changed and Cap-N-Tax is totally dead.

That will never happen.

> Until then, no jobs!

Bullshit. There are plenty of jobs. American corporations created over
3 million jobs last year, most in foreign countries. Until the
Republican-sponsored legislation that rewards corporations for
outsourcing is repealed, there won't be any jobs in the US.

Buster Norris

1/26/2011 1:33:00 AM

0

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