Find paragraph of X words containing multiple keywords ?

guy038 · Apr 13, 2021, 2:25 PM

Hi, @n_antiyou, @peterjones, @alan-kilborn and All

Ah… Yes, Alan, you’re right about the ¤ character ! So I repost all my previous reply, for a better understanding and to provide new versions of the regexes !

Unlike @peterjones, I will consider a continuous range of any character, even the EOL chars, using the (?s) modifier.

Now, we can associate any common word with its leading non-word char(s), whatever they are, even line-break(s). Therefore, it can be expressed with the regex \W+\w+, which stands for a non-null range of non-word chars followed by a non-null range of word chars

Then, in order to match a block of N words containing the words Word_1 and Word_2 and Word_3, at least once each, use the generic regex, below, written with the free-spacing and multi-lines mode (?x)

Remember that, in this mode :

A space char is not taken in account and must be coded as \x20 or preceded by a \ character )
Any text, after a first # character, is not taken in account, too and is only comments !
To match a literal # char, use, either, the \x23 or \# syntax !

(?xs-i)
(?= ( \W+ \w+ ) {0,N-1} \W+ Word_1 )
(?=    (?1)     {0,N-1} \W+ Word_2 )
(?=    (?1)     {0,N-1} \W+ Word_3 )
       (?1)     {N}

So, if I take up your example, where N = 30 words, without using the free-spacing mode :

Open the Search dialog ( Ctrl + F )
- SEARCH (?s-i)(?=(\W+\w+){0,29}\W+DOG)(?=(?1){0,29}\W+CAT)(?=(?1){0,29}\W+RABBIT)(?1){30} Regex A
- Tick the Wrap around option
- Select the Regular expression search mode
- Click on the Find next button

You may test that regex expression against the sample text, below :

Note, Alan that this regex A selects all the block and not each keyword, individually !

word word word word word word word word word DOG
word word word word word word word word word DOG
word word word word word word word word word word

word word word word word word word word word CAT
word word word word word word word word word CAT
word word word word word word word word word word

word word word word word word word word word RABBIT
word word word word word word word word word RABBIT
word word word word word word word word word word

word word word word word word word word word DOG
word word word word word word word word word CAT
word word word word word word word word word RABBIT

DOG word word word word word word word word word
CAT word word word word word word word word word
RABBIT word word word word word word word word word

word word word RABBIT word word word word word word
word DOG word word word word word word word word
word word word word word word word word CAT word

RABBIT word word word word word DOG word word word
word DOG word word word word CAT word word word
word CAT word word word word word word word RABBIT

word word word word word word word word word word
word word word word word word word word word word
word word word word word word word  CAT DOG RABBIT

DOG RABBIT CAT word word word word word word word
word word word word word word word word word word
word word word word word word word word word word

word word word word word word word word word word
word word word word word word word word word DOG
word word word word word word word word word DOG

word word word word word word word word word word
word word word word word word word word word CAT
word word word word word word word word word CAT

word word word word word word word word word word
word word word word word word word word word RABBIT
word word word word word word word word word RABBIT

word word word word word word word word word word

Now, if you want to match, individually, each word DOG, CAT or RABBIT, of these blocks, we need a temporary character, not existing yet, in current file, which will be located at the end of these blocks

By that means, we’ll be sure that the range, between any found occurrence of CAT, DOG or RABBIT included and this ending anchor, will not exceed 30 words !

I chose the ¤ character as the anchor, but any single char, not regex meta-character, would be OK, too

Open the Replace dialog ( Ctrl + H )
- SEARCH (?s-i)(?=(\W+\w+){0,29}\W+DOG)(?=(?1){0,29}\W+CAT)(?=(?1){0,29}\W+RABBIT)(?1){30}\K Regex B
- REPLACE ¤ ( the anchor )
- Tick the Wrap around option
- Select the Regular expression search mode
- Click on the Replace All button ( Do not use the Replace button )

You should get this output :

word word word word word word word word word DOG
word word word word word word word word word DOG
word word word word word word word word word word

word word word word word word word word word CAT
word word word word word word word word word CAT
word word word word word word word word word word

word word word word word word word word word RABBIT
word word word word word word word word word RABBIT
word word word word word word word word word word

word word word word word word word word word DOG
word word word word word word word word word CAT
word word word word word word word word word RABBIT¤

DOG word word word word word word word word word
CAT word word word word word word word word word
RABBIT word word word word word word word word word¤

word word word RABBIT word word word word word word
word DOG word word word word word word word word
word word word word word word word word CAT word¤

RABBIT word word word word word DOG word word word
word DOG word word word word CAT word word word
word CAT word word word word word word word RABBIT¤

word word word word word word word word word word
word word word word word word word word word word
word word word word word word word  CAT DOG RABBIT¤

DOG RABBIT CAT word word word word word word word
word word word word word word word word word word
word word word word word word word word word word¤

word word word word word word word word word word
word word word word word word word word word DOG
word word word word word word word word word DOG

word word word word word word word word word word
word word word word word word word word word CAT
word word word word word word word word word CAT

word word word word word word word word word word
word word word word word word word word word RABBIT
word word word word word word word word word RABBIT

word word word word word word word word word word

Then, against this modified text, above, the search or marking of any word DOG, CAT or RABBIT, within the concerned sections, can be performed with the regex :

SEARCH / MARK (?-i)(DOG|CAT|RABBIT)(?=(\W+\w+){0,29}¤) Regex C

Alan, this time, any keyword, inside the concerned blocks, are individually matched with the regex C ! Note that if you would have removed the anchor ¤ at the end of the look-ahead, the regex engine would have found absolutely all the occurrences of the keywords DOG, CAT or RABBIT ! Not what we expect to ! Hence, the necessity of the anchor ;-))

Finally, in order to delete the temporary ¤ character, use this trivial regex :

SEARCH ¤
REPLACE Leave EMPTY

Best Regards,

guy038

Alan Kilborn · Apr 13, 2021, 2:44 PM

@guy038

Thank you for the clarifications.

n_antiyou · Apr 13, 2021, 2:58 PM

@guy038 This is it! It works! Ahahah

I am not sure if I did correct. To be honest, I have understood about 10% of what you guys wrote. But I copied

(?s-i)(?=(\W+\w+){0,29}\W+DOG)(?=(?1){0,29}\W+CAT)(?=(?1){0,29}\W+RABBIT)(?1){30}

substituing DOG/RABBIT/CAT with 3 other keywords, and notepad++ found a portion of the text 30 words long containing all 3.

This is exactly what I was looking for.

Now, I have only 2 questions left:

1) If I want to modify the size of the portion of the text I want to find ( lets say from 30 to 50 ), would it look like this:

" (?s-i)(?=(\W+\w+){0,49}\W+guidato)(?=(?1){0,49}\W+parte)(?=(?1){0,49}\W+contributi)(?1){50} " ?

2 ) What is the expression to achieve the same result, but with 4 and 5 keywords instead of 3? ( I know I could just ask what’s the pattern to follow to add more keywords… if you want you can write it down… I am scared that I won’t understand it tho )

n_antiyou · Apr 13, 2021, 3:03 PM

Oh, and one more ( sorry )

3 ) I see that notepad, when entering the expression and hitting "find ", it brings me to the proper place where the portion of the text is, and then enlightens it in grey. Is there a way to make so it also englithens the 3 keywords INSIDE, with a different color? ( any color, even the same color for all 3 keywords )
You may look at the picture I sent above as an example.

PeterJones · Apr 13, 2021, 3:04 PM

@n_antiyou

Yep, that’s right.
each one of the (?=(\W+\w+){0,49}\W+guidato) terms applies to one of your required words. You’ll notice right now, there are three of those terms, each with one of your required words. You just need to add more of the same terms but with the new words.
with a different color? not in the same regular expression, sorry

n_antiyou · Apr 13, 2021, 3:11 PM

Perfect, so assuming 6 keywords and 300 words as size, it should look like this:

(?s-i)(?=(\W+\w+){0,299}\W+word1)(?=(\W+\w+){0,299}\W+word2)(?=(\W+\w+){0,299}\W+word3)(?=(\W+\w+){0,299}\W+word4)(?=(\W+\w+){0,299}\W+word5)(?=(\W+\w+){0,299}\W+word6)(?1){300}

Correct?

I’m starting to think this is a bit too complex tho. Not the expression per se, since once I understand how it works I can make new ones on my own, but the process takes time. Aren’t there programs that do this kind of research with a friendly UI?
Maybe I could find people on fiverr to develop an extention of google chrome that does this kind of research, so that it would also work on a PDF without converting to txt alltogether.

guy038 · Apr 13, 2021, 3:16 PM

Hi, @n_antiyou,

Give me some minutes ! your last regex can be simplified ;-))

BR

guy038

Alan Kilborn · Apr 13, 2021, 3:17 PM

@n_antiyou said in Find paragraph of X words containing multiple keywords ?:

Aren’t there programs that do this kind of research with a friendly UI?

Are there? I guess you’d have to go and find them then.

Maybe I could find people on fiverr to develop an extention of google chrome that does this kind of research, so that it would also work on a PDF without converting to txt alltogether.

Are there people standing by just to do this sort of thing?
That’s nice if so.
Maybe they can field some of the oddball need regex questions we get asked here.

n_antiyou · Apr 13, 2021, 3:20 PM

There might be, there’s people that do all sorts of things on fiverr it seems. XD

guy038 · Apr 13, 2021, 3:59 PM

Hello, @n_antiyou, @peterjones, @alan-kilborn and All

@n_antiyou,

For 6 keywords, you can use that mono-line regex , below, in free-spacing mode, which enables you to place any space within this long regex for a better readability !

SEARCH / MARK (?xs-i) (?=(\W+ \w+){0,299} \W+ Word_1) (?=(?1){0,299} \W+ Word_2) (?=(?1){0,299} \W+ Word_3) (?=(?1){0,299} \W+ Word_4) (?=(?1){0,299} \W+ Word_5) (?=(?1){0,299} \W+ Word_6) (?1){300}

Now, you may use the Search > Mark All > Using #th style in order to highlight your keywords with a specific color. Note that, for your 6th keyword, you’ll have to cheat a bit by applying two successive highlightings to the same word ! Just try to mix two styles ;-))

Best Regards,

guy038

P.S. :

Note that the syntax (\W+ \w+), near the beginning of the regex, defines the group 1 containing the sub-regex \W+\w+, which is re-used, further on, thanks to the simple syntax (?1)

You’ll find some links to improve yourself in regexes here !

guy038 · Apr 13, 2021, 7:05 PM

Hi, @n_antiyou and All,

As I said in my previous post, you may mix some styles, from the 5 styles, available by default, to get other colors, in order to color all your keywords !

Refer to this post by @Claudia-Frank, who, unfortunately, is no longer active on this forum ! Her contribution was quite important and she provided quantity of excellent Python scripts, too ! Let’s wish her the best and good coding moments ;-))

https://community.notepad-plus-plus.org/post/27621

With the help of the NppQCP plugin ( Quick Color Plugin ), I built up a Word image which recapitulates the main style combinations, with significant colors and their RGB coordinates

Best Regards,

guy038