Sub-string in regex

I have seen this word been mentioned a lot in regex and wonder really what it means, can someone please explain its meaning?
Thank you)

A “substring” is a piece of a string. For example “day” is a substring in “Thursday”.

Oh so its like part of a word??

It can be any piece of a string.
If you have “Hello World!” then “o W” and “!” are possible substrings.

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