Regular Expressions 101

Explanation
Pro

^start of string

Group 1(.*:\d\d)

.*any Unicode character (except for line terminators), repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\da Unicode decimal digit

Group 2((\.\d{1,3})(\d*))?

?repeats the group contents below at most once:

Group 3(\.\d{1,3})

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a Unicode decimal digit, repeated between 1 and 3 times

Group 4(\d*)

\d*a Unicode decimal digit, repeated any number of times

Group 5(-\d\d)?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da Unicode decimal digit

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

^(.*:\d\d)((\.\d{1,3})(\d*))?(-\d\d)?

5,SUk,35,31-03-2015 12:24:37.12345-02

5,SUk,35,31-03-2015 12:24:37.12345-02