What's the best way to split this kind of string?


#1

Hi!

I’m trying to make a routine to make a Morris Number Sequence.
(http://www.ocf.berkeley.edu/~stoll/number_sequence.html)
I need to split a string in the following way, for example.

“111223133” => [“111”, “22”, “3”, “1”, “33”]

I can loop thru the string by each character, comparing with the
previous character.
But is there a quick and easy way?
Probably a regular expression?

Thanks.

Sam


#2

Sam K. wrote:

Hi!

I’m trying to make a routine to make a Morris Number Sequence.
(http://www.ocf.berkeley.edu/~stoll/number_sequence.html)
I need to split a string in the following way, for example.

“111223133” => [“111”, “22”, “3”, “1”, “33”]

I can loop thru the string by each character, comparing with the
previous character.
But is there a quick and easy way?
Probably a regular expression?

This seems to work:

“111223133”.scan(/1+|2+|3+|4+|5+|6+|7+|8+|9+|0+/)
=> [“111”, “22”, “3”, “1”, “33”]


– Jim W.


#3

On Mon, 2006-03-13 at 16:58 +0900, Sam K. wrote:

But is there a quick and easy way?
Probably a regular expression?

Maybe something like:

s.scan(/(\d)(\1*)/).map! { |e| e.join }
# => ["111", "22", "3", "1", "33"]

or:

s.scan(/0+|1+|2+|3+|4+|5+|6+|7+|8+|9+/)
# => ["111", "22", "3", "1", "33"]

#4

Sam K. wrote:

But is there a quick and easy way?
Probably a regular expression?

Thanks.

Sam

“111223133”.scan(/(.)(\1*)/).map{|x|x.join}


#5

On 3/13/06, Ross B. removed_email_address@domain.invalid wrote:

Maybe something like:

    s.scan(/(\d)(\1*)/).map! { |e| e.join }
    # => ["111", "22", "3", "1", "33"]

Hmm… Clever


#6

On Mon, 13 Mar 2006 17:23:56 +0900, Ross B.
removed_email_address@domain.invalid
wrote:
[snip]

Maybe something like:

s.scan(/(\d)(\1*)/).map! { |e| e.join }

=> [“111”, “22”, “3”, “1”, “33”]

or:

s.scan(/0+|1+|2+|3+|4+|5+|6+|7+|8+|9+/)

=> [“111”, “22”, “3”, “1”, “33”]

Or:

s.scan(/((.)\2*)/).transpose[0]

Boy, are my fingers glad to save those keystrokes :slight_smile:

andrew