1.  Added regex to handle <GPH> tag edits
2. Fixed removal of <PRTPAGE ..> tag
1.  Added regex to handle <MATH> tag edits
2. Fixed <CR><LF>
3. Fixe regex for [removed]/[amended] sections
1.  Added regex to handle <MATH> tag edits
2. Fixed <CR><LF>
3. Fixe regex for [removed]/[amended] sections