string routines and code libraries

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Hi,
I am new to C#, coming from Delphi. In Delphi, I am using a 3rd party
string handling library that includes some very useful string
functions, in particular I'm interested in BEFORE (return substring
before a pattern), AFTER (return substring after a pattern), and
BETWEEN (return substring between 2 patterns).
My questions are:
1. Can any tell me how I can implement such functionality in C#?
2. Is it possible to add/include function libraries to C~, and if so
how?

Thank you very much for your help.

Zoro.

.

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