From:             [EMAIL PROTECTED]
Operating system: linux
PHP version:      4.0.4pl1
PHP Bug Type:     PCRE related
Bug description:  preg_replace:  "$dd" pattern in replacement string treated as a 

In php_pcre.c line 630, the dollar sign '$' is also used as in indicator for a 
backreference, which is undocumented. This breaks any replacement string that contains 
the "$dd" pattern where "dd" are numerical digits. For example:

$test = "hello there";
$output = preg_replace("/hello/","$10.00",$test);
print $output;

results in the output:

.00 there

The "$10" is taken as a back reference and resolves to NULL leaving the ".00". 

In my application, I need to merge user generated text that may contain dollar signs. 
I am using preg_replace and doing multiple keyword,value substitutions using arrays.

My only workaround right now is to perform a preliminary preg_replace and insert a 
space after each dollar sign.

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