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Let's say I got a regular expression like this:

/\b[A-Z0-9._%a-zöäüÖÄÜ\-]+@(?:[A-Z0-9a-zöüäÖÜÄ\-]+\.)+[A-Za-z]{2,4}\z/

How can I check via Ruby/RoR if this string is a valid regular expression?

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  • Well I want to check in my code if a submitted regular expression(by the user) is correct. Commented Apr 10, 2014 at 15:10
  • To which field in your db that submitted regular expression save? Commented Apr 10, 2014 at 15:18

1 Answer 1

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3

If it doesn't raise errors, it's a valid regex. :)

def valid_regex?(str)
  Regexp.new(str)
  true
rescue
  false
end

valid_regex?('[a-b]') # => true
valid_regex?('[[a-b]') # => false
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