Hi all, I've an interesting problem. Imagine the following string:
'a1000aa'
I want to break it apart like so:
[ 'a', '1000', 'aa' ]
I did a search on the forums and came up with this regex:
'a1000aa'.scan(/((.)\2*)/).map { |i| i[0] }
Which is pretty close, but it groups on a change of character, so I
would get:
[ 'a', '1', '000', 'aa' ]
I tried playing around with the regex (e.g. swapping the . for (\d|\w))
but to no avail.
Any ideas?
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Daniel Waite wrote:
Hi all, I've an interesting problem. Imagine the following string:
'a1000aa'
I want to break it apart like so:
[ 'a', '1000', 'aa' ]
I did a search on the forums and came up with this regex:
'a1000aa'.scan(/((.)\2*)/).map { |i| i[0] }
Which is pretty close, but it groups on a change of character, so I
would get:[ 'a', '1', '000', 'aa' ]
I tried playing around with the regex (e.g. swapping the . for (\d|\w))
but to no avail.Any ideas?
I figured out one possible solution. Granted, it's not as elegant as a
single regex, but it works and I understand it. Here goes...
First, I opened up class String to add some convenience and make things
a bit shorter:
class String
def letter?
self.first.scan(/[A-Za-z]/).empty? ? false : true
end
def digit?
self.first.scan(/[0123456789]/).empty? ? false : true
end
end
Any my method:
def break_apart_rule_increment
groups = Array.new
string = 'a1000aa'
string.each_char do |character|
# Put the first character into a group.
groups << character and next if groups.empty?
# If this character is of the same kind as the last,
# add it to the group, otherwise, create a new group
# and put it there.
if (groups.last.letter? and character.letter?) or
(groups.last.digit? and character.digit?)
groups.last << character
else
groups << character
end
end
groups
end
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irb(main):001:0> s = 'a1000aa'
=> "a1000aa"
irb(main):002:0> s.split( /(\d+)/ )
=> ["a", "1000", "aa"]
On Sep 27, 9:55 am, Daniel Waite <rabbitb...@gmail.com> wrote:
Hi all, I've an interesting problem. Imagine the following string:
'a1000aa'
I want to break it apart like so:
[ 'a', '1000', 'aa' ]
Or, if you want multiple types of character groupings:
irb(main):001:0> s = 'hello world, you crazy world!'
=> "hello world, you crazy world!"
irb(main):003:0> s.scan( /[aeiou]+|[b-df-hj-np-tv-z]+|[^a-z]+/ )
=> ["h", "e", "ll", "o", " ", "w", "o", "rld", ", ", "y", "ou", " ",
"cr", "a", "zy", " ", "w", "o", "rld", "!"]
On Sep 27, 11:11 am, Phrogz <phr...@mac.com> wrote:
On Sep 27, 9:55 am, Daniel Waite <rabbitb...@gmail.com> wrote:
> Hi all, I've an interesting problem. Imagine the following string:
> 'a1000aa'
> I want to break it apart like so:
> [ 'a', '1000', 'aa' ]
irb(main):001:0> s = 'a1000aa'
=> "a1000aa"
irb(main):002:0> s.split( /(\d+)/ )
=> ["a", "1000", "aa"]
Gavin Kistner wrote:
irb(main):001:0> s = 'a1000aa'
=> "a1000aa"
irb(main):002:0> s.split( /(\d+)/ )
=> ["a", "1000", "aa"]
WOW! Freakin' awesome!
One caveat...
irb(main):004:0> '11aa1000aaa'.split(/(\d+)/)
=> ["", "11", "aa", "1000", "aaa"]
For some reason it answers with a blank element, but I'm sure that's an
easy one to solve.
Thanks, Gavin!
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Gavin Kistner wrote:
On Sep 27, 9:55 am, Daniel Waite <rabbitb...@gmail.com> wrote:
Hi all, I've an interesting problem. Imagine the following string:
'a1000aa'
I want to break it apart like so:
[ 'a', '1000', 'aa' ]
irb(main):001:0> s = 'a1000aa'
=> "a1000aa"
irb(main):002:0> s.split( /(\d+)/ )
=> ["a", "1000", "aa"]
Gavin, how in the WORLD does this bit of black magic work and how did
you ever figure it out???
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Gavin Kistner wrote:
irb(main):001:0> s = 'a1000aa'
=> "a1000aa"
irb(main):002:0> s.split( /(\d+)/ )
=> ["a", "1000", "aa"]WOW! Freakin' awesome!
One caveat...
irb(main):004:0> '11aa1000aaa'.split(/(\d+)/)
=> ["", "11", "aa", "1000", "aaa"]For some reason it answers with a blank element, but I'm sure that's an
easy one to solve.
If you just want digits and non-digits, I suggest:
>> '11aa1000aaa'.scan(/\D+|\d+/)
=> ["11", "aa", "1000", "aaa"]
James Edward Gray II
On Sep 27, 2007, at 7:05 PM, Daniel Waite wrote:
Gavin Kistner wrote:
Hi all, I've an interesting problem. Imagine the following string:
'a1000aa'
I want to break it apart like so:
[ 'a', '1000', 'aa' ]
irb(main):001:0> s = 'a1000aa'
=> "a1000aa"
irb(main):002:0> s.split( /(\d+)/ )
=> ["a", "1000", "aa"]Gavin,
I'm not Gavin, but...
how in the WORLD does this bit of black magic work
Captures in a Regexp passed to split() are returned as part of the result.
and how did you ever figure it out???
Interestingly, the documentation doesn't seem to mention it. I guess I knew it was there because Perl works the same way and I tried it sometime.
James Edward Gray II
On Sep 28, 2007, at 6:09 AM, Lloyd Linklater wrote:
On Sep 27, 9:55 am, Daniel Waite <rabbitb...@gmail.com> wrote:
James Gray wrote:
If you just want digits and non-digits, I suggest:
>> '11aa1000aaa'.scan(/\D+|\d+/)
=> ["11", "aa", "1000", "aaa"]
I LOVE it! I gotta brush up on my regex skills. Wait, I need to get some
regex skills first. 
Thanks, Edward; that made my night.
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I'm not Gavin, but...
Ditto
Interestingly, the documentation doesn't seem to mention it. I guess
I knew it was there because Perl works the same way and I tried it
sometime.
Ditto
James Edward Gray II
Not ditto
On Sep 28, 7:23 am, James Edward Gray II <ja...@grayproductions.net> wrote:
--
-yossef