Increase numbers within a line of text by a certain number.

Posted 27 June 2012 - 04:20 AM

Hi,

I want to start work on a programme that enables me to edit the below peice of text within an xml file.

<AREA SHAPE=rect COORDS="419,2049,551,2088" HREF="54043" >

1. I want to increase each of the above co-ordinates by 5.

2. In a different scenario I want to INCREASE co-ordinate 419 and 551 by 20

3. In a different scenario I want to DECREASE co-ordinate 2049 and 2088 by 20

The Co-ordinates will vary between file to file, but will always have 4 on account of it being a rectangle.

Any help and pointers to begin would be helpful. There's no code yet, I plan to start later.