Community
    • Login

    Perl language syntax highlighting troubles (bug or limitation ?)

    Scheduled Pinned Locked Moved Help wanted · · · – – – · · ·
    112 Posts 6 Posters 44.0k Views
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Gilles MaisonneuveG
      Gilles Maisonneuve @Ekopalypse
      last edited by

      @Ekopalypse

      In your Python regexp, what’s the meaning of:

      1. “\3”
      2. “, [2]” and “[2,3]” ?

      If I can understand what I think I could translate a Perl regex code into python (for this case at least).

      1 Reply Last reply Reply Quote 0
      • EkopalypseE
        Ekopalypse
        last edited by

        What about using this
        (?s)((<<)\h+(["|'])(\w+?)\3\h*;.*?\4)

        Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
        • EkopalypseE
          Ekopalypse
          last edited by

          1. is the boost:regex convention to denote match group 3
            and
          2. defines which match group actually should be painted

          Like if you have:

          r'(word1)(word2)(word3)', [2,3]
          

          would mean that only word2 and word3 would be painted
          whereas if you would specify

          r'(word1)(word2)(word3)', [0]
          

          everything would be colored.

          Does this makes sense to you?

          Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
          • Gilles MaisonneuveG
            Gilles Maisonneuve @Ekopalypse
            last edited by

            @Ekopalypse

            I don’t understand your regexp syntax. Perhaps too ‘pythonized’ for me.

            (?s) : what does it mean ? is it ‘s///’ ? or really a non capturing group of ‘s’ ???
            \3 \4 : are they $3 $4, I don’t think as I can’t see a 4th accumulator

            1 Reply Last reply Reply Quote 0
            • EkopalypseE
              Ekopalypse
              last edited by Ekopalypse

              (?s) is a modifier telling the engine that the dot matches line endings
              and yes, the engine uses \1 and $1

              Here the link to the documentation - maybe easier for you.

              1 Reply Last reply Reply Quote 0
              • EkopalypseE
                Ekopalypse
                last edited by

                ooppps

                (?s)((<<)\h+(["|'])(\w+?)\3\h*;.*?\3)

                :-D

                Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
                • Gilles MaisonneuveG
                  Gilles Maisonneuve @Ekopalypse
                  last edited by

                  This post is deleted!
                  1 Reply Last reply Reply Quote 0
                  • Gilles MaisonneuveG
                    Gilles Maisonneuve @Ekopalypse
                    last edited by

                    @Ekopalypse

                    Ok
                    another one: in Python you must say ["|'] instead of Perl ["'] (‘either one of the set’) ? Is that what it means ?

                    EkopalypseE 1 Reply Last reply Reply Quote 0
                    • EkopalypseE
                      Ekopalypse
                      last edited by

                      No, afaik non-capturing group is (?:pattern)
                      This, (?s), just tells the engine that the dot . is matching
                      EOLs like \r\n - if I’m right.

                      1 Reply Last reply Reply Quote 1
                      • EkopalypseE
                        Ekopalypse
                        last edited by Ekopalypse

                        Just for clarification, the python script does NOT use the python regex engine instead
                        it uses the one notepad++ offers, the boost::regex.
                        Yes, you can use the enumeration without the pipe but makes it more visible for me with
                        the pipe sign. Or is there a difference if used with pipe sign or without?

                        1 Reply Last reply Reply Quote 1
                        • EkopalypseE
                          Ekopalypse
                          last edited by Ekopalypse

                          or maybe this one might be even better
                          (?s)(<<)\h+(["'])(\w+?)\2\h*;.*?\3

                          1 Reply Last reply Reply Quote 1
                          • Gilles MaisonneuveG
                            Gilles Maisonneuve
                            last edited by

                            Can’t reply what I wanted, a robot says I’m spamming…

                            Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
                            • EkopalypseE
                              Ekopalypse @Gilles Maisonneuve
                              last edited by

                              @Gilles-Maisonneuve

                              Can’t reply what I wanted, a robot says I’m spamming…

                              I have no idea why this happens sometimes.

                              By the way, now that you have installed pythonscript plugin would you mind
                              clicking Plugins->Python Script->Scripts->Samples->RegexTester ?

                              I know not everyone is recommending it but, personally, I love it.

                              1 Reply Last reply Reply Quote 1
                              • Gilles MaisonneuveG
                                Gilles Maisonneuve @Gilles Maisonneuve
                                last edited by

                                AFAIK, at least in Perl, ["|'] means double-quote OR pipre OR simple-quote, everything between square brakets is literal. Also true in “awk” and C regexp I think.
                                I don’t know for Python.

                                Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                                • Gilles MaisonneuveG
                                  Gilles Maisonneuve @Gilles Maisonneuve
                                  last edited by

                                  @Ekopalypse

                                  Now, if I say in Pyhton (attempt to transliterate from Perl) :

                                  (r'(?s)(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)', [2])
                                  

                                  does it mean :

                                  1. form REGEXP
                                  2. do not match NL with DOT
                                  3. matches any horizontal blanks (0 or more), don’t make a group
                                  4. matches ‘<<’ make it a group
                                  5. matches any horizontal blanks (0 or more), don’t make a group
                                  6. matches 0 or 1 text quote (either double or single), no group
                                  7. matches a group of any chars not " nor ’ one or more time(s) (in perl it would be [^"'])
                                  8. matches 0 or 1 text quote (either double or single), no group
                                  9. possible blanks until semi-colon, semi-colon, then possible chars until NL

                                  BUT THEN, what does mean ?\3. I’m lost there.

                                  Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
                                  • Gilles MaisonneuveG
                                    Gilles Maisonneuve @Gilles Maisonneuve
                                    last edited by

                                    a slash m

                                    EkopalypseE 1 Reply Last reply Reply Quote 0
                                    • EkopalypseE
                                      Ekopalypse
                                      last edited by Ekopalypse

                                      the r at the beginning just informs python that this is a raw string and
                                      every char must be taken literally otherwise backslashes would be treated
                                      as escapes under some circumstances.

                                      The regex string is only this part

                                      (?s)(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)
                                      

                                      and I would say, but as said - not an regex expert at all,

                                      (?s) means Dot matches newline characters
                                      the first matching group is

                                      (\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)
                                      

                                      the second

                                      (<<)
                                      

                                      and the third must be

                                      ([^"|^']+?)
                                      

                                      if I’m right.

                                      \3 should be the same as $3 in perl

                                      Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                                      • Gilles MaisonneuveG
                                        Gilles Maisonneuve @Ekopalypse
                                        last edited by Gilles Maisonneuve

                                        @Ekopalypse

                                        still confused: ([^"|^']+?) why a ‘?’ after the ‘+’ what’s for this ‘?’

                                        and then \3 would mean the 3rd matching group (third ‘()’) but in Perl is used only in subsitutions. What is the use here ? There are only 2 groups in the regex (two blocks surrounded by parenthèses only.

                                        EkopalypseE 1 Reply Last reply Reply Quote 0
                                        • EkopalypseE
                                          Ekopalypse @Gilles Maisonneuve
                                          last edited by

                                          @Gilles-Maisonneuve

                                          maybe this picture makes it a little bit clearer

                                          1 Reply Last reply Reply Quote 2
                                          • EkopalypseE
                                            Ekopalypse @Gilles Maisonneuve
                                            last edited by Ekopalypse

                                            @Gilles-Maisonneuve

                                            still confused: ([^"|^']+?) why a ‘?’ after the ‘+’ what’s for this ‘?’

                                            as less as possible - non-greedy

                                            and then \3 would mean the 3rd matching group (third ‘()’) but in Perl is used only in >subsitutions. What is the use here ? There are only 2 groups in the regex (two blocks >surrounded by parenthèses only.

                                            placeholder for what was found in match group 3, to find the EOT at the end

                                            and there are 3 match groups or am I missing something??

                                            Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                                            • First post
                                              Last post
                                            The Community of users of the Notepad++ text editor.
                                            Powered by NodeBB | Contributors