I'm having some problems concatenating strings in TypeScript. My code is

const str = 'my string';
if(regex1.match(str)) {
    const replaced = str.replace(regex1, '');
    console.log(replaced + '.ts')
}

The problem is in the string concatenation, Node outputs

.tsreplaced

Instead of

replaced.ts

It only happens with that string. Other string concatenations work fine.