VBA RegExp

Can someone explain to me the meaning of this RegExp (The red ones). The concept behind each one and what is going to be achieved with it:

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Thanks for your time. Any good tutorial material or weblink on RegExp will be appreciated.

There you go!

^[^:] - doesn't starts with ":"
+: repeats last char and then ":"
*|; Matches the preceding character zero or more times OR ";"
[^;] Matches any one of the enclosed characters
+$ Matches the preceding character one or more times and matches the end of input.