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Bug #8741 preg functions interpret { as part of variable interpolation
Submitted: 2001-01-16 12:56 UTC Modified: 2001-07-21 04:32 UTC
From: danbeck at dealnews dot com Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 4.0.3pl1 OS: Linux 2.x, Redhat 6.2
Private report: No CVE-ID: None
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From: danbeck at dealnews dot com
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 [2001-01-16 12:56 UTC] danbeck at dealnews dot com 
The following code does not work properly

$number = "999.00";
$precision = 2;
echo preg_replace("/\.0{$precision}/", "", $number);

it echos 999.00

But if you escape the first `{' bracket, the regular expression works properly

echo preg_replace("/\.0\{$precision}/", "", $number);

it echos 999

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 [2001-01-16 15:40 UTC] andrei@php.net 
The {$var} construct is interpreted specially in the double-quoted strings by the Zend engine - it will interpolate the variable so you indeed need to escape it with a backslash. This is not a PCRE problem.
 
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