I'm trying to check whether input from user matches RegEx [a-zA-z]
so I've checked the docs for proper method. I found match?
in Ruby-doc.org and copied the example shown in docs to irb, but instead of true
I'm getting this:
2.3.3 :001 > "Ruby".match?(/R.../)
NoMethodError: undefined method `match?' for "Ruby":String
Did you mean? match
from (irb):1
from /usr/local/rvm/rubies/ruby-2.3.3/bin/irb:11:in `<main>'
Why this method doesn't work in my irb?
String#match?
and Regexp#match?
are Ruby 2.4 new methods. Check here and here.
This new syntax is not only an alias. It's faster than other methods mainly because it doesn't update the $~
global object. According to this benchmark, it runs up to three times faster than other methods.
BTW, in order to achieve your goal (check whether a string matches a regex), you might [1] update your ruby version to use this new feature or [2] use another approach.
For instance, you can use the =~ operator, that returns nil if not found, or the position where the matchs starts. Can be used like that:
if "Ruby" =~ /R.../
puts "found"
end
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