const regex = /(((((((00|\+|0900)49[ \-\/\e\/e]?)|0)[1-9][0-9]{1,4})[ \-\/]?)|((((00|\+)49\()|\(0)[1-9][0-9]{1,4}\)[ \-\/]?))[0-9]{1,7}([ \-\/]?[0-9]{1,5})?)/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(((((((00|\\+|0900)49[ \\-\\\/\\e\\\/e]?)|0)[1-9][0-9]{1,4})[ \\-\\\/]?)|((((00|\\+)49\\()|\\(0)[1-9][0-9]{1,4}\\)[ \\-\\\/]?))[0-9]{1,7}([ \\-\\\/]?[0-9]{1,5})?)', 'g')
const str = ``;
const subst = ``;
// 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