const regex = /(\.\d\d[1-9]?)\d*/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(\\.\\d\\d[1-9]?)\\d*', 'gm')
const str = `3.820
11.325
60.100
441.005
11.23028741
1007.3335471
`;
const subst = `$1`;
// 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