linkify

[gonny]

Hi all,
How I do to convert a url on a link.

$txt = preg_replace("#(^¦[\n ])([\w]+?:youtube[\w]+[^ \"\n\r\t<]*)#ise", "<a href=\"http://www.youtube.com/v/$1\">watch video</a>", $txt );

Attention, because th link coould be on a phrase or is written difernt way, like:
bla bla [youtube.com...] blabla
or bla bla [fr.youtube.com...] bla bla
or bla bla www.youtube.com/watch?v=dOrKLUlh-To&feature= bla bla

but in all cases the word "youtube" is present. So matchin *youtube* only is possible to convert it in a link? and how?

[rocknbil]

I guess we might need a little more info on what you're converting from.

First thing I'd do is remove newlines, this will simplify the task.

$txt = preg_replace('/[\s]+/',' ',$txt);

I don't use # as delimiters simply because those are also comment characters, matter of choice.
Using \s instead of \n\r will nix double spaces, too, which is generally good.

I am GUESSING this is a plain text value you want to convert to a link, correct?

$pre_link = '<a href=\"http://www.youtube.com/v/';
$post_link = '">';
$close_link = 'watch video</a>';

I'd do it like this:
- look for youtube literal
- look for =
- look for first occurrence of &, if not found, it's the end of pattern so this will be a space or nothing at all.

What's between = and & is what I want.

$txt= preg_replace('/\s*.*?youtube[^=]+=([^\&]+)[\&\s]*/i',"$pre_link$1$post_link$close_link",$txt);

\s* = on the off chance it's the very first line, zero or more for the start, but most likely they will start with a space (newlines converted to spaces in first reg).
.*? = zero or more of any character, with quantifier to avoid greedy pattern matching
youtube = duh. :-)
[^=]+ = one or more of anything NOT a =
= = literal =
([^\&]+) = one or more of anything NOT an ampersand, store this in $1
[\&\s]* = zero or more ampersands or a space. This may not have the ampersand so it's possible it will end with a space, but like the beginning of the pattern, this may be the end of the line.

Untested, may not work, but it's worth a shot. :-)

[gonny]

Ok,
First I thank you for reply and help me.
Now, I report some bug of this code:
1.This code hide text before the link (bla1 bla1) ex. (bla1 bla1 [video-url...] bla2 bla2) and show only text after the code ([u]watch video[/u] bla2 bla2).
2. Show also a part of video link [u]watch video[/u]&amp;feature=related bla2 bla2

(*)To get the video code I use: preg_match("/v=([^(\&¦$)]*)/", $txt, $matches);
$yt_id = $matches[1];
so, $txt= preg_replace('/\s*.*?youtube[^=]+=([^\&]+)[\&\s]*/i',"<a href=\"http://www.youtube.com/v/$yt_video\">Watch video</a>",$txt);

[rocknbil]

Probably a better way to help is by example. Show us what you will be working with and what you hope to set it to.

Example,

"This is what it comes from"
bla bla bla

"This is what I want"

bla not bla bla