How do I replace special characters with regex in javascript?

Question

I need to replace special characters from a string, like this:

this.value = this.value.replace(/\\n/g,\'\');

Except for the regex part, I need

Answer 1

You can use character class with ^ negation:

this.value = this.value.replace(/[^a-zA-Z0-9_-]/g,'');

Tests:

console.log('Abc054_34-bd'.replace(/[^a-zA-Z0-9_-]/g,'')); // Abc054_34-bd
console.log('Fš 04//4.'.replace(/[^a-zA-Z0-9_-]/g,'')); // F044

So by putting characters in [^...], you can decide which characters should be allowed and all others replaced.