rubyregexrubular

Match text exactly after n lines

Using regular expression match the text exactly after n lines.

In the below example, I want to ensure that request is exactly after 3rd line from id: 1

Example:

signal {
   id: 1
   files: 1.bin
   major: 338013710701
   request {
      reqId: 101
      files: 1.bin
      major: 35723057325
      status: Sent
   }
   response {
      resId: 201
      files: 1.bin
      major: 27151510570
      status: Accepted
   }
}

Note: The value of n will vary based on the input(n may have the value upto than 100). where n is number of lines after which the string is present

I tried with the regular expression /signal\s*{\s*id:\s*1\n[^\n]*\n[^\n]*\s*request/m for the above example since n the value of n is minimal.

Can anyone help in framing the regular expression if n is 100? Thanks in advance.

Solution

  • The {100} quantifier indicated that the preceding (\n[^\n]*) should occur exactly 100 times:

    /signal\s{\s*id:\s*1(\n[^\n]*){100}request/m

    see demo