Uncollapse digits

Question

Task

Given a string of English names of digits “collapsed” together, like this:

zeronineoneoneeighttwoseventhreesixfourtwofive

Split the string back into digits:

zero nine one one eight two seven three six four two five

Rules

• The input is always a string. It always consists of one or more lowercase English digit names, collapsed together, and nothing else.

  • The English digit names are zero one two three four five six seven eight nine.

• The output may be a list of strings, or a new string where the digits are delimited by non-alphabetic, non-empty strings. (Your output may also optionally have such strings at the beginning or end, and the delimiters need not be consistent. So even something like {{ zero0one$$two ); is a valid (if absurd) answer for zeroonetwo.)

• The shortest answer in bytes wins.

Test cases

three -> three
eightsix -> eight six
fivefourseven -> five four seven
ninethreesixthree -> nine three six three
foursixeighttwofive -> four six eight two five
fivethreefivesixthreenineonesevenoneeight -> five three five six three nine one seven one eight
threesevensevensixninenineninefiveeighttwofiveeightsixthreeeight -> three seven seven six nine nine nine five eight two five eight six three eight
zeroonetwothreefourfivesixseveneightnine -> zero one two three four five six seven eight nine

Answer 1

GNU sed, 35 bytes

(including +1 for the -r flag)

s/([ots]|[zfn].|(se|th|ei).)../ &/g

Just a simple regexp replacement.

Answer 2

Ruby, 33 bytes

->s{s.scan(/..[eox]|[tse]?..../)}

Try it online!

(Everybody else is doing it, so why can't we?)

Answer 3

Perl5, 26 bytes

echo zeronineoneoneeighttwoseventhreesixfourtwofive \
| perl -ple 's/..[eox]|[tse]?..../$& /g'

Or just the program:

s/..[eox]|[tse]?..../$& /g

Answer 4

Deorst, 22 bytes

'..[eox]|[tse]?....'gf

Try it online!

Of course, this uses the regex found by Uriel. Although, it’s great when Deorst beats Pyth and Jelly :P

Answer 5

Matlab, 432 bytes

A long attempt.

s=char(input('','s'));o=[];while length(s)>0;switch s(1:2);case'ze';o=[o,' ',s(1:4)];s(1:4)=[];case'on';o=[o,' ',s(1:3)];s(1:3)=[];case'tw';o=[o,' ',s(1:3)];s(1:3)=[];case 'th';o=[o,' ',s(1:5)];s(1:5)=[];case'fo';o=[o,' ',s(1:4)];s(1:4)=[];case'fi';o=[o,' ',s(1:4)];s(1:4)=[];case 'si';o=[o,' ',s(1:3)];s(1:3)=[];case'se';o=[o,' ',s(1:5)];s(1:5)=[];case 'ei';o=[o,' ',s(1:5)];s(1:5)=[];otherwise;o=[o,' ',s(1:4)];s(1:4)=[];end;end;o

ungolfed:

s=char(input('','s'))
o=[]
while length(s)>0
switch s(1:2)
    case 'ze'
        o=[o,' ',s(1:4)]
        s(1:4)=[]
    case 'on'
        o=[o,' ',s(1:3)]
        s(1:3)=[]
    case 'tw'
        o=[o,' ',s(1:3)]
        s(1:3)=[]
    case 'th'
        o=[o,' ',s(1:5)]
        s(1:5)=[]
    case 'fo'
        o=[o,' ',s(1:4)]
        s(1:4)=[]
    case 'fi'
        o=[o,' ',s(1:4)]
        s(1:4)=[]
    case 'si'
        o=[o,' ',s(1:3)]
        s(1:3)=[]
    case 'se'
        o=[o,' ',s(1:5)]
        s(1:5)=[]
    case 'ei'
        o=[o,' ',s(1:5)]
        s(1:5)=[]
    otherwise
        o=[o,' ',s(1:4)]
        s(1:4)=[]
end
end
o

Answer 6

Ruby, 77 bytes

puts gets.gsub(/(one|two|three|four|five|six|seven|eight|nine)/,' \1 ').strip

Try it online!