Handing regex string to method

Question

Within a method, I want to dynamically evaluate the following code chunk with a regex:

if (/^[A-F][A-Z]*[^\.\*]$/).match(some_value)

The method I attempted is this:

def check(val)
  if (/^[val][A-Z]*[^\.\*]$/).match(some_value)
    puts "foo"
  else
    puts "waa"
  end
end
check("A-F")

The value I am passing in is not making it there correctly. It appears that passing a value in this fashion needs something more. Is this not something you can do with a method?

It's not necessary to escape . or * inside [...]. [^.*] will suffice. — the Tin Man
– the Tin Man, Commented Jul 16, 2014 at 18:39

Uri Agassi · Accepted Answer · 2014-07-16 17:48:58Z

3

You expected string interpolation. To do that, you need to use the interpolation syntax #{}:

def check(val)
  if (/^[#{val}][A-Z]*[^\.\*]$/).match(some_value)
    puts "foo"
  else
    puts "waa"
  end
end

answered Jul 16, 2014 at 17:48

Uri Agassi

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2 Comments

Will Von Wizzlepig Over a year ago

Ah! Dang, that was easy. I did not know you could use the #{} outside of quotes. Thank you!

Will Von Wizzlepig Over a year ago

Oh, gotcha- gotta click the check.

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