Regular expression question - GoFuckYourself.com

PSD · 09-14-2013, 04:49 PM

Using php I would like to detect something in a string depending on whether the part immediately after the matched part does not contain certain characters. I think I may need to use a lookahead negative assertion as explained here but it is not working as I would expect so not sure. So for example:

Code:

$string = 'test aadfadf random text kalkdfjakdf>apple peach orange';

I want an expression that will detect everything up to the > so long as apple does not immediately follow the >

I tried

Code:

if(preg_match("/test(.*)>(?!apple))/i",$string)){
echo 'true since apple does not follow > in string';
}else{
echo 'false since apple follows > in string';
}

When the string contains apple after the > it returns false as I expect and need but when I change the string to have peach after the > instead of apple it still returns false and I need it to return true. Any ideas?

freecartoonporn · 09-15-2013, 02:10 AM

try stackoverflow, i do the same and get issues solved within minutes...

first thing make sure you have regex part correct ...
and then the php is the very easy.

PSD · 09-15-2013, 02:13 AM

ha, I did endup there and your right got answer right away, had an extra parenthese at the end. Thanks for the reply.

freecartoonporn · 09-15-2013, 07:15 AM

Quote:

Originally Posted by JCK

ha, I did endup there and your right got answer right away, had an extra parenthese at the end. Thanks for the reply.

np, just hit the thanks button.

09-14-2013, 04:49 PM	#1
PSD PornSiteDomains.com Industry Role: Join Date: Oct 2002 Location: US Posts: 1,265	Regular expression question Using php I would like to detect something in a string depending on whether the part immediately after the matched part does not contain certain characters. I think I may need to use a lookahead negative assertion as explained here but it is not working as I would expect so not sure. So for example: Code: $string = 'test aadfadf random text kalkdfjakdf>apple peach orange'; I want an expression that will detect everything up to the > so long as apple does not immediately follow the > I tried Code: if(preg_match("/test(.*)>(?!apple))/i",$string)){ echo 'true since apple does not follow > in string'; }else{ echo 'false since apple follows > in string'; } When the string contains apple after the > it returns false as I expect and need but when I change the string to have peach after the > instead of apple it still returns false and I need it to return true. Any ideas?

09-15-2013, 02:10 AM	#2
freecartoonporn Confirmed User Industry Role: Join Date: Jan 2012 Location: NC Posts: 7,683	try stackoverflow, i do the same and get issues solved within minutes... first thing make sure you have regex part correct ... and then the php is the very easy. __________________ SSD Cloud Server, VPS Server, Simple Cloud Hosting \| DigitalOcean

09-15-2013, 02:13 AM	#3
PSD PornSiteDomains.com Industry Role: Join Date: Oct 2002 Location: US Posts: 1,265	ha, I did endup there and your right got answer right away, had an extra parenthese at the end. Thanks for the reply.