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Pickory
Legend
March 22, 2024
Answered

Regex to remove pattern from sequence

  • March 22, 2024
  • 2 replies
  • 1203 views

Hi,

 

I have a sequence of strings seperated by a comma.

 

1x,2x,1y,2y,1aa,2aa,1bb,1cc,2bb,2cc

 

I want to remove all of the strings starting with 2.  So my string would look like this:

1x,1y,1aa,1bb,1cc

 

I want to maintain the comma delimiter. Note the end of the sequence does not have a comma.

Currently I am using:

 

var s = "1j,2j,1vv,2vv,2xx,1N,2Y,1abc";

s = ( s.replace ( "2[^,]*", "", "g"));

alert ( s );

 

But I get left with double comma, which I clean up later.

 

Any suggestions for a better, faster solution, would be very welocome.

 

Thanks.

 

P.

 

    This topic has been closed for replies.
    Correct answer m1b

    Hi @Pickory, not a huge improvement but this is how I would do it:

    var s = '2x,1y,2y,1aa,2aa,1bb,1cc,2bb,2cc'
    .replace(/(^|,)2[^,]*/g, '')
    .replace(/^,/, '');

$.writeln(s);

     The 2nd replace is needed for when the "2" is found at the start.

    - Mark

    2 replies

    E
    Community Expert
    Eugene TysonCommunity Expert
    Community Expert
    March 23, 2024

    I just tried a GREP search didn't do the script 

     

    but this works for me in GREP

    ,(?<=,)2\w+

     

    Change all seems to work

     

     

     

      m1b
      Community Expert
      m1bCommunity Expert
      Community Expert
      March 23, 2024

      Hi @Eugene Tyson, yes that's how you would do it via the UI, but you can't use lookbehinds in ExtendScript RegExp.

      - Mark

        E
        Community Expert
        Eugene TysonCommunity Expert
        Community Expert
        March 23, 2024

        Ah yes - I see that - just wanted to put the GREP up there in case it was useful 😄

        Thanks

          m1b
          Community Expert
          m1bCommunity ExpertCorrect answer
          Community Expert
          March 23, 2024

          Hi @Pickory, not a huge improvement but this is how I would do it:

          var s = '2x,1y,2y,1aa,2aa,1bb,1cc,2bb,2cc'
    .replace(/(^|,)2[^,]*/g, '')
    .replace(/^,/, '');

$.writeln(s);

           The 2nd replace is needed for when the "2" is found at the start.

          - Mark

            P
            PickoryAuthor
            Legend
            March 23, 2024

            Thank you all for looking.

             

            I think I will go with the one from Mark.

             

            P.

            Marc Autret
            Marc Autret
            Legend
            March 25, 2024

            Hi Pickory,

             

            Definitely just for fun:

            s = ((','+s).match(/,[^2][^,]*/g)||[]).join('').slice(1);

            😉

             

            Best,

            Marc

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