# The Challenge

I always write my math assignments down in the same way. For example:

pg. 420: #25, 50-56, 90
pg. 26: #50-60 evens, 70-80 odds, 90-99 3s
pg. 69: #12, 16, 18, 37


But I need you to tell me the individual problem numbers. For example:

input:
pg. 420: #25, 50-56, 90

output:
25, 50, 51, 52, 53, 54, 55, 56, 90


Here are the rules for telling me my problem numbers:

The assignment always starts with pg. (number): #, feel free to discard it.

Each group of problems is separated by a comma, and different patterns mean different things.

A single number (4, 6, 7438, 698236) just means that one problem is in the assignment.

Two numbers with a dash between them means those two numbers and all integers between. For example, 1-6 would become 1, 2, 3, 4, 5, 6

If two numbers have a dash between them, then there's a word, there is a special rule for the numbers.

If the word is evens, then all even numbers between the two are included (1-6 evens -> 2, 4, 6).

If the word is odds, then all odd numbers between the two are included (1-6 odds -> 1, 3, 5).

If the word is 3s, then all numbers where n mod 3 = 0 between the two are included (1-6 3s -> 3, 6);

## Test Examples: (inputs then outputs)

pg. 1: #1, 2, 3
1, 2, 3

pg. 82: #76, 84-87, 91, 94-100 evens, 103-112 3s
76, 84, 85, 86, 87, 91, 94, 96, 98, 100, 103, 106, 109, 112

pg. 9001: #9000-9002 odds
9001


This is code-golf, so your score is the number of bytes.

• Would stuff like "every other odd/even" be a valid input? Or "every other problem"? Oct 19, 2015 at 22:15
• @CᴏɴᴏʀO'Bʀɪᴇɴ Those wouldn't be valid input currently; do you think they should be? Oct 19, 2015 at 22:18
• No, just wondering. Oct 19, 2015 at 23:18
• I feel like we've had this challenge before.
– xnor
Oct 19, 2015 at 23:26
• Closely related: Tell me how many math problems I have to do! Oct 19, 2015 at 23:49

# JavaScript (ES7), 138 bytes

F=s=>s.replace(/.*#|(\d+)-?(\d+)? ?(\d|\w*)s?/g,(_,a,b,c)=>b?[for(i of Array(b-a--+1))if(++a*c?(b-a)%c<1:!c||a%2==c>'f')a].join, :a||'')


F=s=>s.replace(/.*#|(\d+)-?(\d+)? ?(\d|\w*)s?/g,(_,a,b,c)=>b?[for(i of Array(b-a--+1))if(++a*c?(b-a)%c<1:!c||a%2==c>'f')a].join, :a||'')
button.onclick=()=>output.innerHTML=F(range.value)
button, textarea {
display: block;
width: 100%;
margin-bottom: 0.5em;
box-sizing: border-box;
}
<textarea id="range"></textarea>
<button id="button">submit</button>
<div id="output"></div>