Regular Expression "Not Followed By" Help

Hey,

I'm currently using preg_match(), and I've ran into a regular expression question.

I want to search a chunk of text for something like @Apple. I only want to return true though if it's @Apple.

So, "Text @Apple, some other stuff." returns true.

But, "Text @Apple123 some other stuff." doesn't.

Can any tell me what the regular expression is to check that something ISN'T followed by A-Za-z0-9? Any other punctuation is fine. I just want to make sure it is only finding @Apple, not any other alteration of it.

Thanks in advance for any help!

 

Try this one

$txt='Text @Apple, some other stuff';
$re1='.*?';
$re2='(@)';
$re3='(Apple)';	# Word 1

$re=$re1.$re2.$re3;
if ($txt =~ m/$re/is)
{
    $c1=$1;
    $word1=$2;
    print "($c1) ($word1) \n";
}

PHP:

 

<?php

$str = 'Text @Apple, some other stuff';

print preg_match('/@Apple(?![A-Za-z0-9]+)/', $str, $tmp) ? 'good' : 'bad';
?>

PHP:

 

Here's a splash of manual page to go with Kaimis reply. http://php.net/manual/de/regexp.reference.assertions.php