I have a string like:

string1: http://localapp/lkasdjasd/answers/156, Lorem ipsum dolor? is it Lorem, nah? | Here is the answer

Need to split the string on first vertical bar after first comma:

1. key: 156
2. string1: Lorem ipsum dolor? is it Lorem, nah?
3. string2: Here is the answer

arr   = line.split(',')
key   = arr[0].split('/')[-1].to_i
title = arr[1]
desc  = arr[2]

So far I figured out only how to get the key

CodePudding user response：

You can use

/\A(?:[^,]*[^\d,])?(\d ),([^|]*)\|\s*(. )/

See the Rubular demo. Details:

• \A - start of string
• (?:[^,]*[^\d,])? - an optional sequence of zero or more non-commas and then a char other than a digit and comma
• (\d ) - Group 1: one or more digits
• , - a comma
• ([^|]*) - Group 2: zero or more non-pipe chars
• \| - a | char
• \s* - zero or more whitespaces
• (. ) - Group 3: one or more chars other than line break chars as many as possible.

See a Ruby demo:

s = 'http://localapp/lkasdjasd/answers/156, Lorem ipsum dolor? is it Lorem, nah? | Here is the answer'
/\A(?:[^,]*[^\d,])?(?<key>\d ),(?<title>[^|]*)\|\s*(?<desc>. )/ =~ s
puts "Key: #{key}\nTitle: #{title}\nDescription: #{desc}"

Output:

Key: 156
Title:  Lorem ipsum dolor? is it Lorem, nah? 
Description: Here is the answer

CodePudding user response：

The following answers what is asked for in the title and in the third line. That is not consistent with the desired result, however.

r = /\A([^,]*,[^|]*)\|(.*)/x

"Little Miss Muffett, sat on | a tuffet".scan(r).first
  #=> ["Little Miss Muffett, sat on ", " a tuffet"]

"Little | Miss, Muffett, sat on |, a | tuffet".scan(r).first
  #=> ["Little | Miss, Muffett, sat on ", ", a | tuffet"]

We can write the regular expression in free-spacing mode to make it self-documenting.

r = /
    \A       # match beginning of string
    (        # begin capture group 1
      [^,]*  # match 0 or more chars other than a comma
      ,      # match a comma
      [^|]*  # match 0 or more chars other than a pipe
    )        # end capture group 1
    \|       # match a pipe
    (.*)     # match 0 or more chars and save to capture group 2
    /x       # invoke free-spacing regex definition mode

See String#scan for an explanation of how the method treats regular expressions that contain capture groups.

CodePudding user response：

I vote for the answer: https://stackoverflow.com/a/69299320/13841038 on which you can call .to_i and .strip while printing

key.to_i
title.strip
desc.strip

If you don't prefer regex, then below snippet is a modified version of your solution

str = "http://localapp/lkasdjasd/answers/156, Lorem ipsum dolor? is it Lorem, nah? | Here is the answer"

pipe_arr   = str.split('|')
arr        = pipe_arr[0].split(',')

key        = arr[0].split('/')[-1].to_i
title      = (arr[1]   ','   arr[2]).strip
desc       = pipe_arr[1].strip