Why is my string matching something in an array when that string doesn't contain any of those characters?

Question

Using Rails 5 and Ruby 2.4. I can't understand why the below is matching . I have an array of strings and I want to see if my string matches any of those in the array, so I tried this

2.4.0 :021 > SEPARATOR_TOKENS = ["-"]
 => ["-"]
2.4.0 :022 > data = "W40"
 => "W40"
2.4.0 :023 > data =~ /[#{Regexp.union(SEPARATOR_TOKENS)}]/
 => 0

even though there is no "-" in my string, it is reporting a match. HOw do I correct this? Note, I have radically sipmlified this example so using an ".include?" is not an option because what I'm doing will eventually include regular expressions.

user3723506 · Accepted Answer · 2017-03-26 01:50:27Z

1

Regexp.union already produces a regular expression, you don't need to use /.../

Try this:

data =~ Regexp.union(SEPARATOR_TOKENS)

answered Mar 26, 2017 at 1:50

user3723506

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1 Comment

Dave Over a year ago

K, I oversimplkfied by example so much, your answer is right, but it misses the point of waht I wanted to know. Stay tuned for a new re-formatted question I'm goign to ask if you want to pick up some more cheap points.

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