findFirstStringInBracket.js

// findFirstStringInBracket
const findFirstStringInBracket = (str) => {
 if (str.length === 0) {
 return "";
 }

 let indexFirstBracketFound = str.indexOf("(");
 if (indexFirstBracketFound < 0) {
 return "";
 }

 let wordsAfterFirstBracket = str.substr(indexFirstBracketFound);
 if (!wordsAfterFirstBracket) {
 return "";
 }

 let indexClosingBracketFound = wordsAfterFirstBracket.indexOf(")");
 if (indexClosingBracketFound < 0) {
 return ''
 }

 return wordsAfterFirstBracket.substring(1, indexClosingBracketFound);
}

// Alternative using regex

const findFirstStringInBracketRegex = (str) => {
 if (str.length === 0) {
 return "";
 }

 const stringWithParentheses = str.match(/\([^)]*\)/).pop();

 return stringWithParentheses.substring(1, --stringWithParentheses.lengh)
}