Optimization Regex for dxf-File LINE objects only

Question

Consider a String containing a chain with or without stuff in between of elements like

LINE
 8
0
 62
0
 10
86.106
 20
-319.701000011
 11
61.722
 21
-319.701000011
 0

I use the following regex to find the coordinates of each LINE:

LINE\n 8\n\d\n 62\n\d\n 10\n(?<X1>-?\d+\.\d+)\n 20\n(?<Y1>-?\d+\.\d+)\n 11\n(?<X2>-?\d+\.\d+)\n 21\n(?<Y2>-?\d+\.\d+)\n 0\n?

I get correctly for every LINE element 4 groups in the example X1 = 86.106, Y1 = -319.701000011, X2 = 61.722, Y2 = -319.701000011

I created it with a tutorial for regex. So is there anything I can learn from improving this attempt?

For example I imagine its very useful, if I could round the group results already to 3 decimal places.