Determine which substring from array is present in given string

Question

I have a array of few string

For ex: ["hello", "World", "nice"]

Now i have a long url string with special string.

I want to find out which string from above array is present in my url string using Ruby and return that string.

Use each and check to see if it's in the URL. What's the specific issue? What have you tried so far? — Dave Newton
– Dave Newton, Commented Apr 11, 2014 at 15:30
i want to avoid each and want some useful regex which can give me that substring in less time. — Swati
– Swati, Commented Apr 11, 2014 at 15:31
And you've determined this is a relevant performance bottleneck in your system??? So join them together with a | and do a regex. Then do the relevant performance tests. Then ponder if the time you wasted was actually worth it. — Dave Newton
– Dave Newton, Commented Apr 11, 2014 at 15:58

Uri Agassi · Accepted Answer · 2014-04-11 15:30:57Z

2

Use find:

words.find { |w| url[w] }

Example:

 ["hello", "World", "nice"].find { |w| "this is nice"[w] }
 # => "nice"

answered Apr 11, 2014 at 15:30

Uri Agassi

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1 Comment

Matheus Moreira Over a year ago

+1, I came here to post this! To add to your answer, note that find/detect will return the first match only. The methods find_all/select are available if one needs all the values that match.

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