'just try this 
$a = "<exp>2a+&alpha;-b2+b&beta;2</exp><br>";
$a =~ s#(<exp>)(.*?)(<\/exp>)#$1.&expr($2).$3#egsi;

print $a;

sub expr
 {
     my($a) = @_;
     
     $a =~ s#([A-Z])#<it>$1</it>#gsi;     
     
     $a =~ s#(\&)(.*?)(\;)#$1.&tmp($2).$3#egsi;     
     
sub tmp {
     my($tmp) = @_;
     $tmp =~ s#(<it>|<\/it>)##gsi;         
     return $tmp;
 }
     
return $a;
     
}

[download]

o/p : <exp>2<it>a</it>+α-<it>b</it>2+<it>b</it>β2</exp>

Regards,

Gubendran.L

In reply to Re: find and replace by gube
in thread find and replace by texuser74

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