const regex = /(\(|,)(\s{0,})([a-zA-Z0-9_?\\]{0,}\s{0,}&{0,}\$[a-zA-Z0-9_]+\s{0,}=\s{0,}[a-zA-Z0-9_'"\[\]]+)(,\s{0,})([a-zA-Z0-9_?\\]{0,}\s{0,}&{0,}\$[a-zA-Z0-9_]+)(\n\s{0,}){0,}(\)|,)/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(\\(|,)(\\s{0,})([a-zA-Z0-9_?\\\\]{0,}\\s{0,}&{0,}\\$[a-zA-Z0-9_]+\\s{0,}=\\s{0,}[a-zA-Z0-9_\'"\\[\\]]+)(,\\s{0,})([a-zA-Z0-9_?\\\\]{0,}\\s{0,}&{0,}\\$[a-zA-Z0-9_]+)(\\n\\s{0,}){0,}(\\)|,)', 'gm')
const str = ``;
const subst = `$1$2$5$4$3$6$7`;
// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);
console.log('Substitution result: ', result);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions