Regular Expression to Prefix Search Results with "000"

I want to prefix some data using a reqular expression.  I am using this expression to locate all UPC numbers that are 11 digitis in length.  ^\d{11}$   but I want to know if I can prefix the results with "000".  

Locate this:                              Transform to this:

20349098761                           00020349098761
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Terry WoodsIT GuruCommented:
What language or tool are you using?

If it was php you'd use something like:
$data = preg_replace('/^(\d{11})$/','000$1',$data);
Terry WoodsIT GuruCommented:
Using a lookahead is more elegant and should also work:
$data = preg_replace('/^(?=\d{11}$)/','000',$data);

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Derek JensenCommented:
preg_replace_all can prefix all of them at once:

$data = preg_replace_all('/^(?=\d{11}$)/','000',$data);  

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käµfm³d 👽Commented:

Which documentation are you looking at? preg_replace_all doesn't appear to be a valid PHP function, and the preg_replace that Terry mentions will replace every occurrence by default--unless you specify how many occurrences to replace by passing an additional parameter.
Derek JensenCommented:

You're absolutely right, I'm a tardbucket...I was thinking of preg_match_all. My bad. :">
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Regular Expressions

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