Regular Expressions 101

Explanation
Pro

^start of line

Group 1(((\d+\s+){3}\d+)|(\d+\.\d*\s+\d+\.\d*))

1st Alternative((\d+\s+){3}\d+)

Group 2((\d+\s+){3}\d+)

Group 3(\d+\s+){3}

{3}repeats the group contents below exactly 3 times:

\d+a digit, repeated at least once

\s+any whitespace character, repeated at least once

\d+a digit, repeated at least once

2nd Alternative(\d+\.\d*\s+\d+\.\d*)

Group 4(\d+\.\d*\s+\d+\.\d*)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

\s+any whitespace character, repeated at least once

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

\s*any whitespace character, repeated any number of times

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

26 tokens

^(((\d+\s+){3}\d+)|(\d+\.\d*\s+\d+\.\d*))\s*$

New

element 1 2
8 24 2 1 1
0 1 129
2 2 0 0 
30.200001 1000.0000
208 0 0 0 0 0 0 0