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preg_replace url rel’s

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Jan 21.2007

hi all, id like to add nofollows onto my links on my forum…

basicly before the skin is printed, id like to replace my links and add the rel=”nofollow” attribute…

ive seen the many tutorials on how to make your [link] into <a etc.. but im not sure how to apply the knwoledge to this situation…im not really changing much, just adding rel=”nofollow” into the link…

help?

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PHP

6 Comments(s) ↴

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@NightShift58Jan 21.2007 — help?[/quote]code?
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@deep-woodauthorJan 23.2007 — thats the thing, i have no idea what do write?

all im wanting to add rel="nofollow" before the > where the code code before it was <a href="(whatever..)"

from what ive tried to learn from various articles and stuff, id guess..

preg_replace("&lt;a href="(.+?)"&gt;(.+?)&lt;/a&gt;",&lt;a href="$1" rel="nofollow"&gt;$2&lt;/a&gt;",$test)

is that a start?
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@NogDogJan 23.2007 — Untested:
[code=php]
$test = preg_replace('/(<a[srn]+[^>]+)>/i', '\1 rel="nofollow">', $test);
[/code]
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@deep-woodauthorJan 23.2007 — Untested:
[code=php]
$test = preg_replace('/(<a[srn]+[^>]+)>/i', '\1 rel="nofollow">', $test);
[/code][/QUOTE]
wow nodog thats amazing!

would you mind if you explain what all the diff bits mean? im yet to find a good tutorial on regex and looking at your code makes me go wow! lol

thankyou kindly
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@NogDogJan 23.2007 — <i>
</i>'/(&lt;a[srn]+[^&gt;]+)&gt;/i' :

/ = start regex pattern
( = start sub-pattern
&lt;a = &lt;a
[srn]+ = one or more occurrences of any white-space, CR, or LF characters
[^&gt;]+ = one or more occurrences of any character that's not a "&gt;"
) = end of sub-pattern
<i>&gt; </i>= &gt;
/ = end of pattern
i = case-Insensitive modifier

The "1" in the replacement means whatever was captured by the first (and only in this case) sub-pattern.
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@bokehJan 23.2007 — [code][srn]+ = one or more occurrences of any white-space, CR, or LF characters[/QUOTE]I probably would have used a word boundrary here ([B]b[/B]) but that's by the by; what is fact though is the character class is redundant in this case. [B]s[/B] matches ASCII characters 9, 10, 12, 13, 32 and 160. So CR and LF (ASCII 10 and 13 respectively) are already covered by [B]s[/B].
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