Delete the entire content of all files with less than 100 words

Alan Kilborn

@rodica-f said in Delete the entire content of all files with less than 100 words:

can you please formulate a complete regex solution?

Yes, Neil please provide complete solution, taking into account every possible situation that we can’t know about, because we don’t know everything about OP’s data. :-)

Why are we even helping the notorious “Robin Cruise” anyway?

Terry R

@neil-schipper said in Delete the entire content of all files with less than 100 words:

None of our solutions tolerates non-word, non-space characters such as punctuation. A robust solution should probably make use of constructs like \W or [[:punct:]].

I find this problem very intriguing. So I set my mind adrift in the regex documentation because; as @Neil-Schipper pointed out; this will likely involve use of character classes, which is where I had also considered it must go.

It firstly involves what constitutes a word, most likely one or more “non-space” characters shown together. I fell upon a character class identifed as [[:space:]], and it’s opposite [^[:space:]].

So using @Alan-Kilborn regex I altered it to be:
FW(?s)\A([[:space:]]*([^[:space:]]+[[:space:]]+){98,}.+)|.+
RW:\1

I’m still not convinced I’m entirely there but I’ve put it up for public consumption. Maybe someone else wants to take it a bit further, refine it?

So the premise is, find more than x number of words first, followed by the remainder of the file. As this is captured, return it. If this is not possible then use the alternation code and select all of the file and as it is not captured don’t return it. Hence we delete the file content if not equal or greater than the x number we seek.

Terry

Actually now I’ve posted I can see straight away I don’t need {98,}, it can just be {98} as the following .+ takes care of the rest.

guy038

Hello, @rodica-f, @neil-schipper, @alan-kilborn, @terry-r and All,

@terry-r :

I found out a variant , based on your use of the [[:space:]] POSIX character class !

SEARCH (?s)\A[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,98}[^[:space:]]+[[:space:]]*\z|\A[[:space:]]+\z

REPLACE Leave EMPTY

This regex S/R will delete any content of files containing less than 100 words OR even 0 non-space char followed with some [[:space:]] chars

Best Regards,

guy038

rodica F

@guy038 @Terry-R @Alan-Kilborn @Neil-Schipper

thank you all. It is always a challenge to discover regex solutions.

by the way, I didn’t know the method with [[:punct:]] Where can I find about this regex method on internet? I don’t know how to search about it…

Paul Wormer

@rodica-f
Npp user manual

rodica F

@guy038 said in Delete the entire content of all files with less than 100 words:
(?s)\A[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,98}[^[:space:]]+[[:space:]]*\z|\A[[:space:]]+\z

One more question I have for @guy038 I want to use one of your GENERIC S/R for this case. SO I need to delete the content of a file that have less then 10 words between section <START> and <FINAL>

<START>

The first, thing to note when

<FINAL>

So, I test with all your GENERIC regex formulas you done a long time ago.

BSR = <START>
ESR = <FINAL>
FR = (?s)\A[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,10}[^[:space:]]+[[:space:]]*\z|\A[[:space:]]+\z

REGEX:

(?-si:BSR|(?!\A)\G)(?s-i:(?!ESR).)*?\x20\K(FR)

(?-si:BSR|(?!\A)\G)(?s-i:(?!ESR).)*?\x20\KFR(?=\x20)

(?-si:BSR|(?!\A)\G)(?s-i:(?!ESR).)*?\x20\KFR

(?-si:BSR|(?!\A)\G)(?s-i:(?!ESR).)*?\x20\KFR(?=\x20)

(?-i:BSR|\G(?!^))(?s:(?!ESR).)*?\K(?-i:FR)

(?-i:BSR|(?!\A)\G)(?s:(?!ESR).)*?\K(?-i:FR)

(?-i:BSR|(?!^)\G)(?s:(?!ESR).)*?\K(?-i:FR)

(?-i:BSR|(?!\A)\G)(?s:(?!ESR).)*?\K(?-i:FR)

It is not working, in any of the cases. I get the same message on F/R: “Cannot find the text…”

guy038

Hi, @rodica-f and All,

EDIT : The regexes, below, are incomplete. See the correct solution in my next post

You do not need to use these generic regexes at all !

Simply, replace \A by <START> and \z by <FINAL> and, of course, change the value of the quantifier of the non-capturing group from 98 to 8, giving the functional regex S/R below :

SEARCH (?s)<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,8}[^[:space:]]+[[:space:]]*<FINAL>|<START>[[:space:]]+<FINAL>

REPLACE Leave EMPTY

So, the general formula for deleting all file contents, if there are less than N words between the two boundaries <START> and <FINAL>, is :

SEARCH (?s)<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,N-2}[^[:space:]]+[[:space:]]*<FINAL>|<START>[[:space:]]+<FINAL>

REPLACE Leave EMPTY

BR

guy038

rodica F

@guy038 correct me if I’m wrong. The GENERIC formula in this case will be:

(?s)BSR(FR)*ESR|BSR+ESR

I think I’m wrong somewhere.

rodica F

@guy038 by the way I test your generic formula you done for me.

(?s)<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,8}[^[:space:]]+[[:space:]]*<FINAL>|<START>[[:space:]]+<FINAL>

In the context below, delete only everything that is framed in <START> and <FINAL>

But does not delete the entire file, I mean the other words around it.

blah blah     blah


<START>

The first, thing to note when

<FINAL>

   blah blah

guy038

Hello, @rodica-f and All,

Oh… Yes ! I was wrong about it ! The correct regex S/R is, of course :

SEARCH (?s)\A.*<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,8}[^[:space:]]+[[:space:]]*<FINAL>.*\z|\A.*<START>[[:space:]]+<FINAL>.*\z

REPLACE Leave EMPTY

And the general formula for deleting all file contents, if there are less than N words between the two boundaries <START> and <FINAL>, becomes :

SEARCH (?s)\A.*<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,N-2}[^[:space:]]+[[:space:]]*<FINAL>.*\z|\A.*<START>[[:space:]]+<FINAL>.*\z

REPLACE Leave EMPTY

This regex will delete all file contents in all these cases :

If there no non-space char ( 0 word ), and only some space chars => the regex is \A.*<START>[[:space:]]+<FINAL>.*\z ( the part after the | symbol )
If there are several non-space chars ( one word ), possibly surrounded with space chars => quantifier = 0 and the regex becomes (?s)\A.*<START>[[:space:]]*[^[:space:]]+[[:space:]]*<FINAL>.*\z
If there are several non-space chars followed with space chars, twice ( so two words) => quantifier = 1 and the regex becomes (?s)\A.*<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+)[^[:space:]]+[[:space:]]*<FINAL>.*\z
If there are several non-space chars followed with space chars, third times ( so three words) => quantifier = 2 and the regex becomes (?s)\A.*<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){2}[^[:space:]]+[[:space:]]*<FINAL>.*\z

and so on… till :

If there are several non-space chars followed with space chars, ninth times ( so nine words) => quantifier = 8 and the regex becomes (?s)\A.*<START>[[:space:]]*(?:[^[:space:]]+[[:space:]]+){8}[^[:space:]]+[[:space:]]*<FINAL>.*\z

Now, to answer your question, I would say :

SEARCH (?s)\A.*BSR(FR)ESR.*\z

where FR = [[:space:]]*(?:[^[:space:]]+[[:space:]]+){0,N-2}[^[:space:]]+[[:space:]]* OR FR = [[:space:]]+ ( case no word )

Best Regards,

guy038

rodica F

@guy038 thank you very much !

rodica F

@rodica-f

Delete the entire content of all files with less than 6 words

FIND:
\A(?i)[^\w+]*(?:[\w*]+[^\w*]+){0,5}(?:[\w*]+[^\w+]*)?\z

REPLACE: (LEAVE EMPTY)

guy038

Hi, @rodica-f and All,

I sorry to tell you that your last regex does not meet exactly the previous rules and is rather erroneous !

First, and just anecdotal, the (?i) modifier is useless as no range of letters occurs in your regex

Secondly, this regex will delete all file contents if more than 0 word char and less than 7 word chars

Thirdly, let’s consider this somple phrase :

let abc - xyz

It contains 4 non-space expressions ( let, abc, - and xyz )

Your regex seems OK as it correctly select all text which contains less than 7 words

Now, change the - sign by a + sign :

let abc + xyz

This time, your regex does not match anything although there are, still, 4 non-space expressions :((

Why this behaviour occurs ? Well, the different sub-expressions, that you used in your regex, are erroneous !

[^\w+]* means “find a a char different from a word char and different from the + sign”, repeated from 0 to any

[\w*]+ means “find a word char or a * symbol”, repeated from 1 to any

[^\w*]+ means “find a char different from a word char and different from the * symbol”, repeated from 1 to any

So, an almost-correct solution would be \A[^\w]*(?:\w+[^\w]+){0,4}(?:\w+[^\w]*)?\z. However, note that it also matches a true empty file which does not need any replacement as already empty !!

Now, the important drawback of using word chars \w and non-word chars [^\w], is that any symbol, met in text, will increase the number of words !. For instance, see the difference betwen :

This is a simple example

and :

This is a sim-ple example

If I use my last “word” version \A[^\w]*(?:\w+[^\w]+){0,4}(?:\w+[^\w]*)?\z, it matches the text This is a simple example and not the text This is a sim-ple example ! Because, in the former case, it counts 5 words and, in the later case, it counts 6 words

That’s why my previous and @terry-r’s version, using non-space characters [[:^space:]] and space chars [[:space:]], seems more rigorous and practical ;-))

Best Regards

guy038

rodica F

@guy038 said in Delete the entire content of all files with less than 100 words:

\A[^\w]*(?:\w+[^\w]+){0,4}(?:\w+[^\w]*)?\z

My joy is that, thanks to my regex, an alternative method has been discovered, quite good.

thank you @guy038