Community
    • Login

    Anyone can help with this regex?

    Scheduled Pinned Locked Moved Help wanted · · · – – – · · ·
    15 Posts 8 Posters 9.8k 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.
    • guy038G
      guy038
      last edited by guy038

      Hi All,

      I just forgot to give an example of the general S/R, detailed, in my previous post !

      Then, giving the upper-case string ABC, as a start delimiter and the upper-case string XYZ as en end delimiter, which leads to the regex :

      • SEARCH = (?-s)^.*ABC(?s).*?(?-s)XYZ.*(\R|\z)

      • REPLACE = NOTHING

      The text, below :

      This line, containing ABC, will be deleted
This is a BLOCK

of text which will			 
be DELETED

as well as this line XYZ
This piece of text

will NOT be DELETED

but the BLOCK of the TWO NEXT ONES will
ABC
XYZ
This text, with some blank lines,


won't be modified, but the NEXT line will !
ABCXYZ

The BLOCK of the TWO NEXT lines, below, will be DELETED
12345ABC 67890 ABC
--- XYZ XYZ ---

as well as this LAST block, below
--- ABC --- XYZ --- ABC  

--- ABC --- XYZ --- XYZ --- ABC --- ABCXYZ ---

      will be CHANGED into :

      This piece of text

will NOT be DELETED

but the BLOCK of the TWO NEXT ONES will
This text, with some blank lines,


won't be modified, but the NEXT line will !

The BLOCK of the TWO NEXT lines, below, will be DELETED

as well as this LAST block, below

      Cheers,

      guy038

      pbarneyP 1 Reply Last reply Reply Quote 1
      • pbarneyP
        pbarney @guy038
        last edited by

        @guy038, I swear, I learn so much from you. I had no idea that (?s) and (?-s) could be used anywhere within a search string (and more than once!)

        That is so creative and really a good example of outside the box thinking. It opens up a whole new class of text manipulations for me.

        Thank you for taking the time to share your black-belt level regex experience. If you had a tip jar, I’d put some money in it!

        mkupperM 1 Reply Last reply Reply Quote 0
        • mkupperM
          mkupper @pbarney
          last edited by

          @pbarney Something I’m starting use more are things like (?-i:sub-expression). In that example the ignore-case flag is turned off just for whatever the sub-expression is.

          I’ll also often spread expressions out over multiple lines using free spacing mode but I turn free-spacing off within lines of my regexp:

          (?x-i) # Mark shutdown/startup log lines
^[01][0-9]/[0-3][0-9]/20[0-9][0-9]\ [012][0-9]:[0-5][0-9]\ (?:
(?-x:Shut down.*\R+)|
(?-x:Start up.*\R+)|
(?-x:Logged in. Device was booted at (?'booted'[01][0-9]/[0-3][0-9]/20[0-9][0-9] [012][0-9]:[0-5][0-9]:[0-5][0-9])(?: adjusted to (?'adjusted'[01][0-9]/[0-3][0-9]/20[0-9][0-9] [012][0-9]:[0-5][0-9]:[0-5][0-9]))?\R)
)
          • Line 1 starts free spacing mode and I want to be in ignore-case.
          • Line 2 matches the time stamp at the start of the log lines I’m dealing with
          • Lines 3, 4, and 5 are the various types of log lines I’m interested in. As I don’t want to have to be alert for \ escaping spaces as I’m in free-spacing mode I turn free-spacing for the body of the line.= using (?-x:sub-expression\R+)

          This allows me to focus on the regexp syntax one line at a time. I can select one line and with Ctrl+F verify that the pattern works. It also makes it easy to add/remove lines other than being alert for dealing with the last line does not have a trailing |.

          The commonly used (?:sub-expression) non-capturing group is a subset of this system.

          gerdb42G 1 Reply Last reply Reply Quote 3
          • gerdb42G
            gerdb42 @mkupper
            last edited by

            @mkupper Don’t feed these (AI-)Trolls. What Bio-Brain would dig up an 10-year old thread just to post some praise?

            pbarneyP 1 Reply Last reply Reply Quote -1
            • pbarneyP
              pbarney @gerdb42
              last edited by pbarney

              @gerdb42 said in Anyone can help with this regex?:

              @mkupper Don’t feed these (AI-)Trolls.

              Dude. Look at my post history.

              What Bio-Brain would dig up an 10-year old thread just to post some praise?

              How about someone who does a search to find an answer instead of just posting a new question that might have been answered a dozen times before?

              How about someone who appreciates the continually quality posts of someone who puts a lot of time in here to help people without a thought of reward?

              Relax, Mr. hall monitor. There’s a reason that topics remain open; some questions and answers remain relevant for a long, long time.

              1 Reply Last reply Reply Quote 3
              • guy038G
                guy038
                last edited by guy038

                Hello, @mkupper, @pbarney, @gerdb42 and All,

                Oh, yes, @mkupper, your use of the (?-x:sub_expression) is quite interesting and I’ve never thought of such syntax, before !

                (?x-i) # Mark shutdown/startup log lines
^[01][0-9]/[0-3][0-9]/20[0-9][0-9]\ [012][0-9]:[0-5][0-9]\ (?:
(?-x:Shut down.*\R+)|
(?-x:Start up.*\R+)|
(?-x:Logged in. Device was booted at (?'booted'[01][0-9]/[0-3][0-9]/20[0-9][0-9] [012][0-9]:[0-5][0-9]:[0-5][0-9])(?: adjusted to (?'adjusted'[01][0-9]/[0-3][0-9]/20[0-9][0-9] [012][0-9]:[0-5][0-9]:[0-5][0-9]))?\R)
)

                Note that, in case there is only one or two chars, in each line of a multi-lines regex, to modify, you could use a composite regex, like below :

                (?x-i) # 'RESPECT case' mode and 'FREE-spacing' mode :

         # Ignore any amount of NON-ESCAPED '\s' chars which lays OUTSIDE a CHARACTER CLASS
         # Ignore ANY text beginning with a NON-ESCAPED # character till the end of CURRENT line

# Mark shutdown/startup log lines
^
[01][0-9]/[0-3][0-9]/20[0-9][0-9]\ [012][0-9]:[0-5][0-9][ ]
(?:
  (Shut[ ]down.*\R+) |
  (Start\ up.*\R+)   |
  (?-x:Logged in. Device was booted at (?'booted'[01][0-9]/[0-3][0-9]/20[0-9][0-9] [012][0-9]:[0-5][0-9]:[0-5][0-9])(?: adjusted to (?'adjusted'[01][0-9]/[0-3][0-9]/20[0-9][0-9] [012][0-9]:[0-5][0-9]:[0-5][0-9]))?\R)
)

                Best Regards,

                guy038

                mkupperM 1 Reply Last reply Reply Quote 1
                • mkupperM
                  mkupper @guy038
                  last edited by

                  @guy038 said in Anyone can help with this regex?:

                  your use of the (?-x:sub_expression) is quite interesting and I’ve never thought of such syntax, before !

                  Something that puzzles me in the Boost manual is the first part of the Modifiers section which has

                  (?imsx-imsx … ) alters which of the perl modifiers are in effect within the pattern, changes take effect from the point that the block is first seen and extend to any enclosing ). Letters before a ‘-’ turn that perl modifier on, letters afterward, turn it off.

                  The thing that bugs me is the ... part and the words changes take effect from the point that the block is first seen and extend to any enclosing.

                  Can the space, dot-dot-dot, space supposed to be a sub-expression?

                  The syntax on the next line in the manual with (?imsx-imsx:pattern) applies the specified modifiers to pattern only. makes perfect sense as the colon is the delimiter. Is there a way to have a sub-expression or pattern when using (?imsx-imsx ... )?

                  I understand (?imsx-imsx) style sytax to turn flags on and off but why is space, dot-dot-dot, space in the manual?

                  1 Reply Last reply Reply Quote 0
                  • guy038G
                    guy038
                    last edited by guy038

                    Hi, @mkupper and All,

                    IMO, it’s probably a typo ! I suppose that it just means (?imsx-imsx: ... ) with anything after the colon till the ending parenthesis.

                    For example, I tested all the cases below, and indeed, the only correct syntax seems to be : (?i:pattern)

                    (?i!pattern)  => 'Find: Invalid Regular Expression' message
(?i"pattern)  => 'Find: Invalid Regular Expression' message
(?i#pattern)  => 'Find: Invalid Regular Expression' message
(?i$pattern)  => 'Find: Invalid Regular Expression' message
(?i%pattern)  => 'Find: Invalid Regular Expression' message
(?i&pattern)  => 'Find: Invalid Regular Expression' message
(?i'pattern)  => 'Find: Invalid Regular Expression' message
(?i(pattern)  => 'Find: Invalid Regular Expression' message
(?i)pattern)  => 'Find: Invalid Regular Expression' message
(?i*pattern)  => 'Find: Invalid Regular Expression' message
(?i+pattern)  => 'Find: Invalid Regular Expression' message
(?i,pattern)  => 'Find: Invalid Regular Expression' message
(?i.pattern)  => 'Find: Invalid Regular Expression' message
(?i-pattern)  => 'Find: Invalid Regular Expression' message
(?i/pattern)  => 'Find: Invalid Regular Expression' message
(?i0pattern)  => 'Find: Invalid Regular Expression' message

(?i:pattern)  =>  Match any string 'pattern' WHATEVER its case

(?i;pattern)  => 'Find: Invalid Regular Expression' message
(?i<pattern)  => 'Find: Invalid Regular Expression' message
(?i=pattern)  => 'Find: Invalid Regular Expression' message
(?i>pattern)  => 'Find: Invalid Regular Expression' message
(?i?pattern)  => 'Find: Invalid Regular Expression' message
(?i@pattern)  => 'Find: Invalid Regular Expression' message
(?iApattern)  => 'Find: Invalid Regular Expression' message
(?i[pattern)  => 'Find: Invalid Regular Expression' message
(?i\pattern)  => 'Find: Invalid Regular Expression' message
(?i]pattern)  => 'Find: Invalid Regular Expression' message
(?i^pattern)  => 'Find: Invalid Regular Expression' message
(?i_pattern)  => 'Find: Invalid Regular Expression' message
(?i`pattern)  => 'Find: Invalid Regular Expression' message
(?iapattern)  => 'Find: Invalid Regular Expression' message
(?i{pattern)  => 'Find: Invalid Regular Expression' message
(?i|pattern)  => 'Find: Invalid Regular Expression' message
(?i}pattern)  => 'Find: Invalid Regular Expression' message
(?i~pattern)  => 'Find: Invalid Regular Expression' message

                    Best Regards,

                    guy038

                    mkupperM 1 Reply Last reply Reply Quote 2
                    • mkupperM
                      mkupper @guy038
                      last edited by

                      @guy038 You may have some fun with (?P:...)

                      It’s not included in the documentation but is supported by Boost. https://stackoverflow.com/questions/10059673/named-regular-expression-group-pgroup-nameregexp-what-does-p-stand-for has a fascinating background.

                      I found that as I wondered if there were any valid flags other than [smix]. I also found that Boost does not care if you use a flag more than once. If a flag is both before and after the - then it’s turned off. Boost does not complain about (?-:...)

                      1 Reply Last reply Reply Quote 0
                      • guy038G
                        guy038
                        last edited by guy038

                        Hello, @mkupper and All,

                        Ah… OK. So I ran an other series of tests, below :

                        (?!:pattern)  =>  Search any empty string, NON followed with the string ':pattern')  => So, roughly, match any EMPTY string

(?":pattern)  =>  'Find Invalid Regular Expression' message

(?#:pattern)  =>  Search any empty string, followed with the comment ':pattern' )    => So, roughly, match any EMPTY string

(?$:pattern)  =>  'Find Invalid Regular Expression' message
(?%:pattern)  =>  'Find Invalid Regular Expression' message
(?&:pattern)  =>  'Find Invalid Regular Expression' message
(?':pattern)  =>  'Find Invalid Regular Expression' message
(?(:pattern)  =>  'Find Invalid Regular Expression' message
(?):pattern)  =>  'Find Invalid Regular Expression' message
(?*:pattern)  =>  'Find Invalid Regular Expression' message
(?+:pattern)  =>  'Find Invalid Regular Expression' message
(?,:pattern)  =>  'Find Invalid Regular Expression' message
(?.:pattern)  =>  'Find Invalid Regular Expression' message

(?-:pattern)  =>  Match any string 'pattern', according to the 'Match case' option 'ON' or 'OFF'

(?/:pattern)  =>  'Find Invalid Regular Expression' message
(?0:pattern)  =>  'Find Invalid Regular Expression' message
(?1:pattern)  =>  'Find Invalid Regular Expression' message
(?2:pattern)  =>  'Find Invalid Regular Expression' message
(?3:pattern)  =>  'Find Invalid Regular Expression' message
(?4:pattern)  =>  'Find Invalid Regular Expression' message
(?5:pattern)  =>  'Find Invalid Regular Expression' message
(?6:pattern)  =>  'Find Invalid Regular Expression' message
(?7:pattern)  =>  'Find Invalid Regular Expression' message
(?8:pattern)  =>  'Find Invalid Regular Expression' message
(?9:pattern)  =>  'Find Invalid Regular Expression' message

(?::pattern)  =>  Match any string ':pattern', according to the 'Match case' option 'ON' or 'OFF'

(?;:pattern)  =>  'Find Invalid Regular Expression' message
(?<:pattern)  =>  'Find Invalid Regular Expression' message
(?=:pattern)  =>  'Find Invalid Regular Expression' message

(?>:pattern)  =>  Match any ATOMIC string ':pattern', according to the 'Match case' option 'ON' or 'OFF'

(??:pattern)  =>  'Find Invalid Regular Expression' message
(?@:pattern)  =>  'Find Invalid Regular Expression' message
(?A:pattern)  =>  'Find Invalid Regular Expression' message
(?B:pattern)  =>  'Find Invalid Regular Expression' message
(?C:pattern)  =>  'Find Invalid Regular Expression' message
(?D:pattern)  =>  'Find Invalid Regular Expression' message
(?E:pattern)  =>  'Find Invalid Regular Expression' message
(?F:pattern)  =>  'Find Invalid Regular Expression' message
(?G:pattern)  =>  'Find Invalid Regular Expression' message
(?H:pattern)  =>  'Find Invalid Regular Expression' message
(?I:pattern)  =>  'Find Invalid Regular Expression' message
(?J:pattern)  =>  'Find Invalid Regular Expression' message
(?K:pattern)  =>  'Find Invalid Regular Expression' message
(?L:pattern)  =>  'Find Invalid Regular Expression' message
(?M:pattern)  =>  'Find Invalid Regular Expression' message
(?N:pattern)  =>  'Find Invalid Regular Expression' message
(?O:pattern)  =>  'Find Invalid Regular Expression' message

(?P:pattern)  =>  Match any string 'pattern', according to the 'Match case' option 'ON' or 'OFF'
(?Ppattern)   =>  

(?Q:pattern)  =>  'Find Invalid Regular Expression' message
(?R:pattern)  =>  'Find Invalid Regular Expression' message
(?S:pattern)  =>  'Find Invalid Regular Expression' message
(?T:pattern)  =>  'Find Invalid Regular Expression' message
(?U:pattern)  =>  'Find Invalid Regular Expression' message
(?V:pattern)  =>  'Find Invalid Regular Expression' message
(?W:pattern)  =>  'Find Invalid Regular Expression' message
(?C:pattern)  =>  'Find Invalid Regular Expression' message
(?Y:pattern)  =>  'Find Invalid Regular Expression' message
(?Z:pattern)  =>  'Find Invalid Regular Expression' message
(?[:pattern)  =>  'Find Invalid Regular Expression' message
(?\:pattern)  =>  'Find Invalid Regular Expression' message
(?]:pattern)  =>  'Find Invalid Regular Expression' message
(?^:pattern)  =>  'Find Invalid Regular Expression' message
(?_:pattern)  =>  'Find Invalid Regular Expression' message
(?`:pattern)  =>  'Find Invalid Regular Expression' message
(?a:pattern)  =>  'Find Invalid Regular Expression' message
(?b:pattern)  =>  'Find Invalid Regular Expression' message
(?c:pattern)  =>  'Find Invalid Regular Expression' message
(?d:pattern)  =>  'Find Invalid Regular Expression' message
(?e:pattern)  =>  'Find Invalid Regular Expression' message
(?f:pattern)  =>  'Find Invalid Regular Expression' message
(?g:pattern)  =>  'Find Invalid Regular Expression' message
(?h:pattern)  =>  'Find Invalid Regular Expression' message

(?i:pattern)  =>  Match any string 'pattern', AHTEVER its case

(?j:pattern)  =>  'Find Invalid Regular Expression' message
(?k:pattern)  =>  'Find Invalid Regular Expression' message
(?l:pattern)  =>  'Find Invalid Regular Expression' message

(?m:pattern)  =>  Match any string 'pattern', according to the 'Match case' option 'ON' or 'OFF'

(?n:pattern)  =>  'Find Invalid Regular Expression' message
(?o:pattern)  =>  'Find Invalid Regular Expression' message
(?p:pattern)  =>  'Find Invalid Regular Expression' message
(?q:pattern)  =>  'Find Invalid Regular Expression' message
(?r:pattern)  =>  'Find Invalid Regular Expression' message

(?s:pattern)  =>  Match any string 'pattern', according to the 'Match case' option 'ON' or 'OFF'

(?t:pattern)  =>  'Find Invalid Regular Expression' message
(?u:pattern)  =>  'Find Invalid Regular Expression' message
(?v:pattern)  =>  'Find Invalid Regular Expression' message
(?w:pattern)  =>  'Find Invalid Regular Expression' message

(?x:pattern)  =>  Match any string 'pattern', according to the 'Match case' option 'ON' or 'OFF'

(?y:pattern)  =>  'Find Invalid Regular Expression' message
(?z:pattern)  =>  'Find Invalid Regular Expression' message
(?{:pattern)  =>  'Find Invalid Regular Expression' message

(?|:pattern)  =>  Match any string ':pattern', according to the 'Match case' option 'ON' or 'OFF'

(?}:pattern)  =>  'Find Invalid Regular Expression' message
(?~:pattern)  =>  'Find Invalid Regular Expression' message

                        The syntaxes (?P<Name>Regex) and (?P=Name), described in your stackoverflow article, are NOT correct with the present Boost implementation within Notepad++

                        Refer to these two links :

                        https://www.regular-expressions.info/refext.html

                        https://www.regular-expressions.info/refreplacebackref.html

                        For each, once opened, select, if necessary, the Boost choice in the first drop-down list and the Python choice in the second drop-down list and compare… !

                        For instance, the regex (?P<Test>\d+) triggers the Invalid Regular Expression message, whereas the syntaxes (?<Test>\d+) or (?'Test'\d+) do find any NON-empty range of digits

                        On the same way, the regex (?<Test>\d+)ABC(?P=Test) is not valid, whereas the syntaxes (?<Test>\d+)ABC\g<Test> or (?-i)(?<Test>\d+)ABC\k<Test> do find any string ABC embedded by a same string of digits

                        Test my assumptions with the example text, below :

                        1ABC2345
123ABC123
12345ABC9
01ABC01234
ABC
12345ABC12345
123ABC456
6789ABC89

                        Note that the (?P:pattern) syntax, in the first part of this post, look like a (?P<Name>Regex) syntax, where the name part is just replaced by a colon ?!

                        With the example text above, see also the main difference between :

                        • Searching with any of the 12 following regex syntaxes :

                          • (?-i)(?<Test>\d+)ABC\g{Test}

                          • (?-i)(?<Test>\d+)ABC\g<Test>

                          • (?-i)(?<Test>\d+)ABC\g'Test'

                          • (?-i)(?<Test>\d+)ABC\k{Test}

                          • (?-i)(?<Test>\d+)ABC\k<Test>

                          • (?-i)(?<Test>\d+)ABC\k'Test'

                          • (?-i)(?'Test'\d+)ABC\g{Test}

                          • (?-i)(?'Test'\d+)ABC\g<Test>

                          • (?-i)(?'Test'\d+)ABC\g'Test'

                          • (?-i)(?'Test'\d+)ABC\k{Test}

                          • (?-i)(?'Test'\d+)ABC\k<Test>

                          • (?-i)(?'Test'\d+)ABC\k'Test'

                        • And searching with any of the 4 following regex ones :

                          • (?-i)(?<Test>\d+)ABC(?&Test)

                          • (?-i)(?<Test>\d+)ABC(?P>Test)

                          • (?-i)(?'Test'\d+)ABC(?&Test)

                          • (?-i)(?'Test'\d+)ABC(?P>Test)

                        • In the first case, the last part of the regex, after the string ABC, is a back-reference to the present value of the named group Test

                        • In the second case, the last part of the regex, after the string ABC, is a back-reference to the named group Test itself. so, these four regexes should match any line of my example text but the ABC string alone !

                        Remark : any reference to a named group must be case-sensitive. Otherwise, a Find: Invalid Regular expression message is returned !

                        In replacement, if you need to refer to a named group, you can use the $+{Test} syntax. However, note that it will always rewrite the value of named group Test when it was defined and not the last value of group Test !

                        Best Regards,

                        guy038

                        1 Reply Last reply Reply Quote 0
                        • First post
                          Last post
                        The Community of users of the Notepad++ text editor.
                        Powered by NodeBB | Contributors