CODEWITHSUNDEEP
rubyregexstring
Do Thanh Tung
Do Thanh Tung

Reputation: 1333

Regex to get conten between two single quote in ruby

Can you show me the way to get content my device and image in this string by ruby

if(my_device=='galaxytab210') { image = 'http:image.com'

Thank you so much!

Upvotes: 0

Views: 104

Answers (2)

Allolex
Allolex

Reputation: 700

Interestingly, benchmarking some code reveals some very minor efficiencies in using a lookaround instead of the capture group and Array#flatten.

EDIT NOTE: Fixed the code as Arie pointed out and the capture + flatten method appears to be more efficient. This might be due to the speed of Array operations, which are analogous to the C code (and therefore more simply modeled) they are written in in MRI ruby.

#!/usr/bin/env ruby

require 'benchmark'

str = "if(my_device=='galaxytab210') { image = 'http:image.com'"

def with_lookaround(str)
  str.scan(/(?<=')[^'\s]+(?=')/)
end

def with_flatten(str)
  str.scan(/'([^']+)'/).flatten
end

repetitions = 1_000_000

Benchmark.bm do |bm|
  bm.report('with lookaround') { repetitions.times { with_lookaround(str) } }
  bm.report('with array flatten') { repetitions.times { with_flatten(str) } }
end

__END__

           user     system      total        real
with lookaround  5.140000   0.020000   5.160000 (  5.181926)
with array flatten  4.950000   0.020000   4.970000 (  5.041639)

       user     system      total        real
with lookaround  5.200000   0.020000   5.220000 (  5.281581)
with array flatten  4.680000   0.020000   4.700000 (  4.755978)

Upvotes: 1

Arie Xiao
Arie Xiao

Reputation: 14082

str = %q|if(my_device=='galaxytab210') { image = 'http:image.com'|
my_device, image = str.scan(/'([^']+)'/).flatten

Upvotes: 1

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