CODEWITHSUNDEEP
ruby
RAJ
RAJ

Reputation: 898

Extracting numbers and slashes from a string

I have the following string

Policy 023203232/02/05 saved successfully

And I need to extract 023203232/02/05 from the above string and I have written the following code 

puts a[/\d+\/\d+\/\d+/]

And it works fine. But If the number increases with the slashes like, 023203232/02/05/06 I have to include one more \d+ but I don't know how many slashes and number would repeat this way, So any one can suggest me to write some generic solution

If string is

Policy 023203232/02/05 saved successfully

Then 

023203232/02/05

If string is

Policy 023203232/02/05/06 saved successfully

Then

023203232/02/05/06

If string is 

Policy 023203232/02/05/06/08 saved successfully

Then

023203232/02/05/06/08

How to write such a generic regular expression?

Upvotes: 0

Views: 65

Answers (3)

Eric Duminil
Eric Duminil

Reputation: 54223

This regex should be what you're looking for :

/(\d+\/?)+/

It means :

  • At least one pattern of :
    • at least one digit
    • possibly followed by a /

It should be a bit more robust than the other answers :

"Policy 023203232/02/05/06/08 saved successfully"[/(\d+\/?)+/]
# => "023203232/02/05/06/08"
"Policy 023203232/02/05/07/3434343/56 saved successfully 09/56/32"[/(\d+\/?)+/]
# => "023203232/02/05/07/3434343/56"
"Policy // // 023203232/02/05/07/3434343/56 saved successfully 09/56/32"[/(\d+\/?)+/]
# => "023203232/02/05/07/3434343/56"

If you want to make sure that the number is right after 'Policy ' but don't want to have 'Policy ' inside your match, you can use a positive look-behind :

/(?<=Policy )(\d+\/?)+/

Here in action :

"2017/03/31 Policy 023203232/02/05/07/3434343/56 saved successfully"[/(?<=Policy )(\d+\/?)+/]
# => "023203232/02/05/07/3434343/56"

Upvotes: 1

steenslag
steenslag

Reputation: 80065

This one looks for a serie of digits or slashes:

str = "Policy 023203232/02/05/07/3434343/56 saved successfully 09/56/3"
p str.match(/[0-9\/]+/)[0] # => "023203232/02/05/07/3434343/56"

Upvotes: 1

gwcodes
gwcodes

Reputation: 5690

Assuming contiguous digits and slashes (i.e. no spaces in between), this should work:

a.scan(/\d+\/?/).join

Upvotes: 2

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