Description:
------------
There is a problem with PCRE in both PHP-versions (4.3.10 and 5.0.3)

When using preg_replace with:

$b = preg_replace("/(some)thing/", "\\1$replace", $a);

This works fine, as long as $replace does start with any character that is NOT a number.

BUT: if $replace starts with a number (like "1abc") FIRST this string: "\\11abc" will be created.
THEN it will try to replace \\11 by the 11th remembered position instead of replacing \\1 with the 1st one.

This bug could lead to strange/unexpected results and should be fixed soon.

Reproduce code:
---------------
<?php

  $temp = '<input value="test">';
  $a = 123;

  echo "<P>Perl</P>\n";

  $temp1 = preg_replace("/(<[^>]*)test([^>]*>)/Usi", "\\1".$a."\\2", $temp);
  echo $temp1;
  
  echo "<P>POSIX</P>\n";

  $temp1 = eregi_replace("(<[^>]*)test([^>]*>)", "\\1".$a."\\2", $temp);
  echo $temp1;

?>

Expected result:
----------------
<P>Perl</P>
<input value="123">
<P>POSIX</P>
<input value="123">

Actual result:
--------------
<P>Perl</P>
23">
<P>POSIX</P>
<input value="123">