Regular Expression to find a string included between two characters while EXCLUDING the delimiters

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Easy done:

(?<=\[)(.*?)(?=\])

Technically that’s using lookaheads and lookbehinds. See Lookahead and Lookbehind Zero-Width Assertions. The pattern consists of:

  • is preceded by a [ that is not captured (lookbehind);
  • a non-greedy captured group. It’s non-greedy to stop at the first ]; and
  • is followed by a ] that is not captured (lookahead).

Alternatively you can just capture what’s between the square brackets:

\[(.*?)\]

and return the first captured group instead of the entire match.

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