Re: php preg_match_all - exclude some matches

Welcome Gordon:

This group is for posting anything (Q/A) about PHP  — not much more.

If you have a question and the person reading your post has the time, then they will provide an answer.

Of course, that doesn’t stop anyone else from posting or posting a better way.

Your question of:

> Q. i guess 500Kb in a HTML form in $_POST format isn't too much ? Is it Ok ?

I think there is a limit on POST,, but I don’t recall at the moment. Here’s a reference:

https://stackoverflow.com/questions/2364840/what-is-the-size-limit-of-a-post-request

But with files just about any file size that doesn’t overwhelm the server is allowed. I often use the King James Version of the Bible as text file to load into a single variable to show how large a string can be.

I’ve also written code to upload the KJV into a database and search it.

I’ve created a demo (with code) for preg_match() as you can view here:

http://citw.lcc.edu/~sperlt/citw185/examples/reg-expression.php

The data array you mention below reminds me of str_replace() — here’s a demo (with code):

http://citw.lcc.edu/~sperlt/citw185/examples/string-replace.php

I think the above will give you a start on solving your problem.

Cheers,

Tedd


> On Nov 13, 2021, at 8:17 PM, [email protected] wrote:
> 
> Hello. Is this php group JUST for development progress for PHP ? or
> can we ask questions here ? it's the only PHP forum I'm on.
> 
> I've used preg_match quite a bit, but am unfamiliar with preg_match_all.
> 
> Ive not started yet, but I'm going to design a script with a 500Kb
> input  text-file, which i want to use preg_match_all on.
> 
> Q. i guess 500Kb in a HTML form in $_POST format isn't too much ? Is it Ok ?
> 
> In development, I'm going to scan through the data/array & see the
> lines Ive captured for possible exclude text, but even looking at the
> raw data, I see lines I want to EXCLUDE from the results.
> In the live version, I'll use it but have some excluded patterns.
> 
> I have these example lines I want to exclude. (inner patterns).
> 
> "type":"WORD1"
> "type":"WORD2"
> "type":"WORD3"
> 
> Q. Is there a way to use preg_match_all to extract text by an outer
> preg criteria, but if the extracted text also matches one of the
> chosen inner-patterns, it is NOT included in the results.
> 
> Can I do this in one go ? Or will I need to do a foreach loop in the
> results to exclude / remove any unwanted sub-patterns after.
> 
> I'm not sure yet, but I expect the "wanted" text to be 10-20% of the
> original text.
> 
> 
> -- 
> 
> Gordon.