Hello Adam,
You did understand me exactly and perfectly).
Ordering arrays is a good idea but I don't know how to do that
exactly.
For instance, there's a cypher called Polybius square. You write in
the alphabet in a grid like this:
1 a b c d e
2 f g h i j
3 k l m n o
4 p q r s t
5 u v w x y
6 z
There is a way where i/j are equal to make a 5 by 5 square but for me
it's equal since I'm working with a 33-letter Russian alphabet, so no
way to make it a perfect square.
Anyway, a letter has two coordinates and is represented by a two-digit
number. For example, E is 15, K is 21, Z is 61 and so on.
So we have a word, say, PHP. It will look like this: 412341.
What does preg_replace do? Exactly, it's searching 41, then 12, then
23, and so on.
I tried to make a loop:
$length=mb_strlen($str);
for ($i=0; $i<$length; $i+=2) {
$pair=mb_substr($str, $i, 2);
$pair=preg_replace($numbers, $letters, $str);
}
It already smells something not good, but anyway.
If I do that, I have one more problem: say, we have a phrase "PHP is
the best". So we crypt it and get:
412341 2444 452315 12154445
Then the parser begins: "41=>p, 23=>h, 41=>p, (attention!) \s2=>...."
I marked a whitespace as \s so you see what happens.
I might split the string by spaces but I can't imagine what a user
inputs: it might be a dash, for example...
Sorry for such a long message but I'm really annoyed with this
preg_replace's behavior. And it's not the only one task to
accomplish...
Thanks a lot!
--
With best regards from Ukraine,
Andre
Skype: Francophile; Wlm&MSN: arthaelon @ yandex.ru; Jabber: arthaelon @ jabber.org
Yahoo! messenger: andre.polykanine; ICQ: 191749952
Twitter: m_elensule
----- Original message -----
From: Adam Richardson <simpleshot@xxxxxxxxx>
To: php-general@xxxxxxxxxxxxx <php-general@xxxxxxxxxxxxx>
Date: Thursday, May 27, 2010, 7:56:28 AM
Subject: One more time about regexes
On Wed, May 26, 2010 at 11:10 PM, Nilesh Govindarajan <lists@xxxxxxxxxx>wrote:
> ---------- Forwarded message ----------
> From: Nilesh Govindarajan <lists@xxxxxxxxxx>
> Date: Thu, May 27, 2010 at 8:40 AM
> Subject: Re: One more time about regexes
> To: Andre Polykanine <andre@xxxxxxxx>
>
>
> On Thu, May 27, 2010 at 3:33 AM, Andre Polykanine <andre@xxxxxxxx> wrote:
> > Hello everyone,
> >
> > Sorry, but I'm asking one more time (since it's really annoying me and
> > I need to apply some really dirty hacks):
> > Is there a way making preg_replace() pass through the regex one single
> > time searching from left to right and not to erase what it has already
> > done?
> > I can give you a real task I'm accomplishing but the tasks requiring
> > that tend to multiply...
> > Thanks a lot!
> >
> > --
> > With best regards from Ukraine,
> > Andre
> > Http://oire.org/ - The Fantasy blogs of Oire
> > Skype: Francophile; Wlm&MSN: arthaelon @ yandex.ru; Jabber: arthaelon @
> jabber.org
> > Yahoo! messenger: andre.polykanine; ICQ: 191749952
> > Twitter: http://twitter.com/m_elensule
> >
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
> > To unsubscribe, visit: http://www.php.net/unsub.php
> >
> >
>
>
> If you don't want to replace the stuff it has searched then use preg_match
> !
>
> --
> Nilesh Govindarajan
> Facebook: nilesh.gr
> Twitter: nileshgr
> Website: www.itech7.com
>
>
>
> --
> Nilesh Govindarajan
> Facebook: nilesh.gr
> Twitter: nileshgr
> Website: www.itech7.com
>
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>
>
If I'm understanding correctly, Andre, you want to perform a replace
operation, but you're observing that there's an element of recursion
happening (e.g., you replace one item with its replacement, and then the new
replacement is also replaced.)
To my knowledge, this won't happen with a standard preg_replace():
$string = 'Bil & Tom & Phil';
$pattern = '/&/';
$replacement = '&';
// outputs Bil & Tom & Phil
echo preg_replace($pattern, $replacement, $string);
However, if you're using arrays to pass in the patterns and replacements,
then one array item could later be replaced by another (see comment and
example on this page by info at gratisrijden dot nl):
http://php.net/manual/en/function.preg-replace.php
If that's the case, you have to carefully structure the order of the array
items so-as to preclude one replacement having the opportunity to override a
subsequent replacement.
Sorry if I misunderstood. You might want to create a simple example of code
showing what you're working through.
Adam
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