regex mysql not working in php

[GeekSupport]

the sql syntax is working via mysql-front but when i try to echo out the results in php, they're all zero. the sql query below finds titles that match the pattern "copy (#) of $survey_title"

include ("common_db.inc.php");
$title = "COPY (1) of You in 10 years";
$regex_title = eregi_replace('^(copy \()[0-9]*\) of ','',$title);
echo $regex_title;
$uid = 4;

$SQL = 'SELECT title, title regexp "^(copy \\\\\()[0-9]*(\\\\\) of '.$regex_title.')$" as regex
                FROM survey
                WHERE rel_uid = '.$uid;
echo "<br>".nl2br($SQL).'<br>';

$result = mysql_query($SQL);

while ($sql_assoc = mysql_fetch_assoc($result))
{    
    echo $sql_assoc['title'].' | ';
    echo $sql_assoc['regex'].'<br>';    
} 

output

You in 10 years
SELECT title, title regexp "^(copy \()[0-9]*(\) of You in 10 years)$" as regex
FROM survey
WHERE rel_uid = 4
Title2 | 0
Survey1 (All Options) | 0
survey4 | 0
survey5 | 0
Real Survey | 0
asdf | 0
You in 10 years | 0
copy (1) of You in 10 years | 0
copy (2) of You in 10 years | 0
copy (1) of asdf | 0

[GeekSupport]

Fixed

include ("common_db.inc.php");
$title = "COPY (1) of You in 10 years";
$regex_title = eregi_replace('^(copy \()[0-9]*\) of ',null,$title);
echo '|'.$regex_title.'|';
$uid = 4;

$SQL = 'SELECT title, title regexp "^(copy \\\\\\\()[0-9]*(\\\\\\\) of '.$regex_title.')$" as regex
                FROM survey
                WHERE rel_uid = '.$uid;


echo "<br>".nl2br($SQL).'<br>';

$result = mysql_query($SQL);

while ($sql_assoc = mysql_fetch_assoc($result))
{    
    echo $sql_assoc['title'].' | ';
    echo $sql_assoc['regex'].'<br>';
    
}