const regex = /(?sx)
\bblue\b(?=.*(bleu))
|
\bred\b(?=.*(rouge))/gs;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?sx)
\\bblue\\b(?=.*(bleu))
|
\\bred\\b(?=.*(rouge))', 'gs')
const str = `blue cheese, a red nose.
bleu rouge`;
const subst = `\1\2`;
// 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