How to slice off a string in Ruby using another string?

Question

Say I have a sentence similar to the following:

The quick brown fox jumps over the lazy dog

I'd like to slice off everything before and including "jumps", so I am left with:

 over the lazy dog

Currently, I get the index of the part I'd like to remove, then add the length of that part to it, and then slice it, as such:

sentence = "The quick brown fox jumps over the lazy dog"
slice_index = sentence.index("jumps").to_i + sentence.size
sliced_sentence = sentence.slice(slice_index..-1)

Is there a better way of achieving this?

Thanks!

score 5 · Accepted Answer · answered Jul 25 '11 at 21:20

5

Personally, I like the regex solution, but

sentence.split(" jumps ").last

works too, even if there are multiple "jumps".

answered Jul 25 '11 at 21:20

Kyle Heironimus

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Thank you so much for the very simple solution! much better than all the complications I was going through to get the exact same result, and it addresses multiple matches. Much appreciated! – Yuval Karmi Jul 25 '11 at 22:10
2

Using `rpartition` instead will be faster. – Marc-André Lafortune Jul 25 '11 at 23:10

score 3 · Answer 2 · answered Jul 25 '11 at 21:08

3

You could use a regular expression:

sentence =~ /jumps(.*)$/
sliced_sentence = $1
#=> " over the lazy dog"

jump is the word you are looking for, (.*)$ is everything until the end of the string and the brackets represent the first capturing group (which is therefore referenced as $1)

answered Jul 25 '11 at 21:08

Matt

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i'm hitting myself over the head for not thinking about using regular expressions! that would be the most intuitive approach, and so this question gets a one-up. However, I'm awarding to Kyle for his one-line solution using only Ruby functions. Thank you very much! – Yuval Karmi Jul 25 '11 at 22:09

score 1 · Answer 3 · answered Jul 25 '11 at 21:14

Perhaps not the best solution but I would do it like so:

sentence = "The quick brown fox jumps over the lazy dog"
sentence.split(" jumps ")[1]

split divides str into substrings based on a delimiter, returning an array of these substrings. array index 1 will always be the section after the delimiter. This breaks if there are more than one " jumps "

How to slice off a string in Ruby using another string?

3 Answers3