The generated regex is /\bI\S*\s*S\S*\s*A\S*\b/.
Does 'Intl. Scrabble Assoc.' match? Yes.
Does 'Intl Scrabble Assoc' match? Yes.
Does 'I.S.A' match? Yes.
Does 'ISA' match? Yes.
Does 'Intl. SA' match? Yes.
Does 'intl scrabble assoc' match? No.
Does 'i.s.a.' match? No.
Does 'isa' match? No.
Does 'lisa' match? No.
Does 'LISA' match? No.
Does 'LI. S. A.' match? No.