Regular expression

Ruby
1

hi,

puts ‘raja(dklfjdfldjkfd)gopalan(fdf)’.gsub(/((.*))/, ‘raja’)

this gives the output “rajaraja”

But I would like to have the output like raja raja gopalan(fdf)

could anyone please guide me how to write the regular expression for
this?

2

Google ruby greedy regexp

3

This gives the output you said you wanted:

puts ‘raja(dklfjdfldjkfd)gopalan(fdf)’.sub(/((\w*?))/, ’ raja ')
raja raja gopalan(fdf)

4

This is a great time to practice your String comparison skills. Your
Regexp is not the same as mine. Spot the difference.

5

hi Joel P.

Thank you . It works. I designed like

puts ‘raja(dklfjdfldjkfd)gopalan(fdf)’.sub(/((.*?))/, ’ raja ')

But it’s not working, where is the problem?

6

Ok thank you.

7

hi

puts “line1 (SS13864619). line1 (SS13864619), line3
(02).”.sub(/((\w*?))(.)((\w?))/, ‘\1\2’)

it gives the output “line1 (SS13864619). line1 (SS13864619), line3 .”

But I would like to have the output

line1 (SS13864619). line1 , line3 (02)

could you please guide me how to do that?

8

When you’re using Regexp to solve a problem, there’s usually more than
one input-output scenario, so you can establish a set of rules. If
there’s only one scenario then you don’t need Regexp.

9

Yes you are right, but my problem is, each and every time the numbers
inside the bracket would vary, So I need regular expression for
that,isn’t it?

10

line1 (SS13864619) must have been removed. Output would be,

line1 , line3 (02).

11

If that’s all that varies:

irb(main):009:0> s.sub(/(\Aline1 (SS\d+). line1 )((SS\d+))/, ‘\1’)
=> “line1 (SS13864619). line1 , line3 (02).”