$lengeth=length($x)
$temp=substr($x,6) //to get the first six digits
$temp1=substr($x,($length-4),$length) //to get the last 4 
for(int i=0;i<($length-10);i++) {
$temp +='X';
}
$temp +=$temp1;

[download]
the code is untested and surely contains error.

In reply to Re: regular expression by ansh batra
in thread regular expression by Anonymous Monk

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