I need to analyse data used to control machine tool. A sample is shown below.

N335G03X247.16Y580.07K6.89J96.62H1M25
N340M20
N345G45
N350G01X832.56Y692.92C275.44M25
N355M20
N360G46C0
N365G03Y720.88I146.74J13.98H36M25

[download]

I need to find rows which have certain patterns. Some of the numbers are fixed others are variable. For example the first four rows can be written as (the variable numbers all are in a <> and some may be integers) 

N<n>G03X<x>Y<y>K<k>J<j>H1M25
N<n>M20
N<n>G45
N<n>G01X<x>Y<y>C<c>M25

[download]

and I want to find the rows which match these descriptions.
I can see that regular expressions might well be able to do this but I am not sure how to start.

Therefore I would appreciate any pointers and possible examples which will help me to do this.

In reply to Using regular expressions to find patterns in machine tool data by merrymonk

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