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Using sets to find A-Za-z plus the # and - chars ..?

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  • P
    PeterJones @IanSunlun
    last edited by PeterJones Nov 17, 2022, 6:46 PM Nov 17, 2022, 5:17 PM

    @IanSunlun ,

    Except for -, order doesn’t matter inside the [] character class. The period is there because New.Video#column-one is also a valid URL ender end-string.

    FIND = http://mysitename.net/index.php/([\w%.~-]+)#([\w%.~-]+)"
    does match http://mysitename.net/index.php/New_Video#column-one":

    2fb36c05-cd1f-406d-92f6-ec71aec5bb2a-image.png

    A 1 Reply Last reply Nov 17, 2022, 7:46 PM Reply Quote 2
    • A
      Alan Kilborn @PeterJones
      last edited by Nov 17, 2022, 7:46 PM

      @PeterJones said in Using sets to find A-Za-z plus the # and - chars ..?:

      FIND = http://mysitename.net/index.php/([\w%.~-]+)#([\w%.~-]+) "

      Is it worth pointing out that the first two periods here really aren’t periods but rather “match any char”, because they aren’t escaped? Sure, an unescaped . will match a literal period, but it will match other things as well (obviously).

      IMO, OP here needs to stop asking forum questions and go off and study regex.

      1 Reply Last reply Reply Quote 1
      • G
        guy038
        last edited by guy038 Nov 18, 2022, 11:58 AM Nov 18, 2022, 11:39 AM

        Hello, @peterjones,

        In the post below, Peter :

        https://community.notepad-plus-plus.org/post/81643

        You said :

        Actually, it’s not documented in our character classes section. I will remedy that.

        Then, regarding the Character Class feature, may be, this part could be added to the Official Notepad++ Documentation : :

        If we consider the following CHARACTER CLASS structure :
        
        [.......]
        123456789
        
        The POSSIBLE location(s), in order to find the LITERAL character below, are :
        
        LITERAL Character [    :     POSSIBLE at any position, BETWEEN 2 to 8 
                                     POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
        							 
        LITERAL Character ]    :     POSSIBLE at position 2 ONLY
                                     POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
        							 
        LITERAL Character -    :     POSSIBLE at position 2
                                     POSSIBLE at position 8
                                     POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
        							 
        LITERAL Character \    :     POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
        

        Of course, change this layout as you like !

        Best Regards,

        guy038

        A 1 Reply Last reply Nov 18, 2022, 12:34 PM Reply Quote 2
        • A
          Alan Kilborn @guy038
          last edited by Alan Kilborn Nov 18, 2022, 12:35 PM Nov 18, 2022, 12:34 PM

          @guy038

          It is rather awkward to express, but I like your idea.

          My idea for expression:

          • To use a “literal [” in a character class: Use it directly like any other character, e.g. [ab[c]; “escaping” is not necessary (but is permissible), e.g. [ab\\[c]

          • To use a “literal ]” in a character class: Directly right after the opening [ of the class notation, e.g. []abc], OR “escaped” at any position, e.g. [\\]abc] or [a\\]bc]

          • To use a “literal -” in a character class: Directly as the first or last character in the enclosing class notation, e.g. [-abc] or [abc-], OR “escaped” at any position, e.g. [\-abc] or [a\-bc]

          • To use a “literal \” in a character class: Must be doubled (i.e., \\) inside the enclosing class notation, e.g. [ab\\c]

          P 1 Reply Last reply Nov 18, 2022, 2:14 PM Reply Quote 2
          • P
            PeterJones @Alan Kilborn
            last edited by Nov 18, 2022, 2:14 PM

            @Alan-Kilborn & @guy038 ,

            I like those suggestions, especially the way Alan rephrased it: it works much better than my clunky first attempt in the manual, that only included - and was not not very readable.

            Thanks.

            A 1 Reply Last reply Nov 18, 2022, 2:24 PM Reply Quote 2
            • A
              Alan Kilborn @PeterJones
              last edited by Alan Kilborn Nov 18, 2022, 3:22 PM Nov 18, 2022, 2:24 PM

              @PeterJones

              Maybe my first-of-4 bullet points previously should be moved to be the last-of-4, and changed to:

              • To use any other literal character in a character class, just use it directly, i.e., no “escaping” needed

              Maybe it works well as a 2 column 4 row table, headers:

              • Character
              • To use it literally in a character class

              With those headers, the “cell contents” for column 2 could be appropriately shortened to remove redundant verbiage.

              1 Reply Last reply Reply Quote 1
              • G
                guy038
                last edited by Nov 18, 2022, 3:54 PM

                Hi, @peterjones,

                BTW, Peter, do you intend to include, in some way, the end part of this post, regarding the Free-space mode, which is in the Notes section ?

                https://community.notepad-plus-plus.org/post/81368


                Also, did you correctly receive, by e-mail, my attached text file, regarding the TextFX features ?

                Please, I do not want to stress you, unnecessarily ! Just go at your own pace !

                Best Regards

                guy038

                A 1 Reply Last reply Nov 18, 2022, 4:02 PM Reply Quote 1
                • A
                  Alan Kilborn @guy038
                  last edited by Nov 18, 2022, 4:02 PM

                  @guy038 said in Using sets to find A-Za-z plus the # and - chars ..?:

                  do you intend to include, in some way, the end part of this post, regarding the Free-space mode

                  He already did, see HERE .

                  A 1 Reply Last reply Nov 19, 2022, 8:58 PM Reply Quote 1
                  • A
                    Andrew McP @Alan Kilborn
                    last edited by Nov 19, 2022, 8:58 PM

                    @Alan-Kilborn I really admire you guys for figuring out Regular Expressions; I bet you never get lost in real life when you can keep track of the patterns/positions so well, aka good spatial awareness :)

                    Oh and I like the trick of having - as last character before ]

                    A 1 Reply Last reply Nov 19, 2022, 9:04 PM Reply Quote 1
                    • A
                      Alan Kilborn @Andrew McP
                      last edited by Alan Kilborn Nov 19, 2022, 9:06 PM Nov 19, 2022, 9:04 PM

                      @Andrew-McP said in Using sets to find A-Za-z plus the # and - chars ..?:

                      I really admire you guys for figuring out Regular Expressions

                      So if someone says they have “figured out regular expressions”, I pity them. Because it just means they are ripe for an upcoming whipping when a regex misunderstanding of theirs really embarrasses them. :-)

                      It pays to always be humble when discussing regular expressions with others. :-)

                      I bet you never get lost

                      GPS!

                      I like the trick of having - as last character before ]

                      Not so much a trick, as a logical place to put it when you realize that anywhere except the first or last position it must form some sort of “range”.

                      A 1 Reply Last reply Nov 19, 2022, 9:16 PM Reply Quote 1
                      • A
                        Andrew McP @Alan Kilborn
                        last edited by Nov 19, 2022, 9:16 PM

                        @Alan-Kilborn hahahah yes no way would I bet my house on any regular expression I recommend covering all, no matter how perverse, eventualities…

                        1 Reply Last reply Reply Quote 1
                        • G
                          guy038
                          last edited by Nov 23, 2022, 11:35 PM

                          Hello, @peterjones,

                          In my previous post, I forgot to mention the ^ character, which has a special meaning within a Character class !

                          So, here is an updated version of my previous post :

                          If we consider the following CHARACTER CLASS structure :
                          
                          [.......]
                          123456789
                          
                          The POSSIBLE location(s), in order to find the LITERAL character below, are :
                          
                          LITERAL Character [    :     POSSIBLE at any position, BETWEEN 2 to 8 
                                                       POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
                          							 
                          LITERAL Character ]    :     POSSIBLE at position 2 ONLY
                                                       POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
                          							 
                          LITERAL Character -    :     POSSIBLE at position 2
                                                       POSSIBLE at position 8
                                                       POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
                          
                          LITERAL character ^    :     POSSIBLE at any position, BETWEEN 3 and 8
                                                       POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
                          
                          							 
                          LITERAL Character \    :     POSSIBLE at any position, BETWEEN 2 to 8, if PRECEDED with an ANTI-SLASH character
                          

                          And I suppose that @alan-kilborn could add :

                          To use a “literal ^” in a character class: Use it directly like any other character, e.g. [ab^c], but right after the opening [ of the class notation ; “escaping” is not necessary (but is permissible), e.g. [ab\^c]

                          Best Regards,

                          guy038

                          1 Reply Last reply Reply Quote 2
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