I have a string "Search result:16143 Results found", and I need to retrieve 16143 out of it.
I am coding in ruby and I know this would be clean to get it using RegEx (as oppose to splitting string based on delimiters)
How would I retrieve the number from this string in ruby?
> foo = "Search result:16143 Results found"
=> "Search result:16143 Results found"
> foo[/\d+/].to_i
=> 16143
I'm not sure on the syntax in Ruby, but the regular expression would be "(\d+)" meaning a string of digits of size 1 or more. You can try it out here: http://www.rubular.com/
Updated: I believe the syntax is /(\d+)/.match(your_string)
This regular expression should do it:
\d+
For a non regular-expression approach:
irb(main):001:0> foo = "Search result:16143 Results found"
=> "Search result:16143 Results found"
irb(main):002:0> foo[foo.rindex(':')+1..foo.rindex(' Results')-1]
=> "16143"
# check that the string you have matches a regular expression
if foo =~ /Search result:(\d+) Results found/
# the first parenthesized term is put in $1
num_str = $1
puts "I found #{num_str}!"
# if you want to use the match as an integer, remember to use #to_i first
puts "One more would be #{num_str.to_i + 1}!"
end
> foo = "Search result:16143 Results found"
=> "Search result:16143 Results found"
> foo.scan(/\d/).to_i
=> 16143
