const regex = /foo_someType_/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('foo_someType_', 'gm')
const str = `foo_someType_001
foo_someType_002
foo_someType_002
foo_otherType_001
foo_otherType_001`;
const subst = `bar_someType_`;
// 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