Hi, Don't know if it's the best way, but it works:
<?php
$digiword = "123joe123";
$replace =
preg_replace("/(\d)(\D)/","\\1,\\2",preg_replace("/(\D)(\d)/","\\1,\\2",$dig
iword));
print $replace;
?>
will print 123,joe,123
Regards,
Mahmoud
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