Regex to extract iso code in a string in ruby [duplicate]

Question

image_basename = 'fr-ca-test.png'

Langs = {'ca', 'fr-CA', 'en-CA'}

Langs.each do |locale_code|
  return locale_code /(\b|\_|-)#{locale_code}(\b|\_|-)/i.match(image_basename)

  end
end

When the filename contains fr-CA or en-CA. I would like to returns fr-CA not Ca.

How I can fix my regex?

Your Langs is invalid.

sawa
– sawa

2019-03-13 10:40:50 +00:00
Commented Mar 13, 2019 at 10:40 — sawa
– sawa, Commented Mar 13, 2019 at 10:40

spickermann · Accepted Answer · 2019-03-13 13:39:01Z

2

I wouldn't use a regexp in this simple example. Using start_with? will very likely be faster and IMHO it is easier to read and to understand:

image_basename = 'fr-ca-test.png'
LANGUAGES = ['fr-CA', 'en-CA', 'ca']

LANGUAGES.find { |code| image_basename.start_with?(code.downcase) }
#=> "fr-CA"

edited Mar 13, 2019 at 13:39

answered Mar 13, 2019 at 10:55

spickermann

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2 Comments

Bolo Over a year ago

filename can be 'fr-ca-test.png' or test-'fr-ca.png' or 'blalb-fr-CA-bllb.png'

spickermann Over a year ago

You might want to use include? instead of start_with? in that case. Furthermore, make sure that your LANGUAGES array is sorted from the most specific to less specific code because find returned the first match.

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