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a little PHP reg exp help pls


i would like to search out all non-numeric characters in my string and replace
them with nothing in PHP.
i tried


but, i get this error: Warning: No ending delimiter found in
/var/www/html/mm/tmp2.php3 on line x

can somebody help me do this correctly pls?

thanks a lot in advance,

INXS: "perl -pi -e 's|[^0-9]||g' file.here" works perfectly in command line
perl.  so what did i do wrong when i tried it in PHP?

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