regardless of ~
Expresses that something holds true irrespective of a particular factor, equivalent to 'regardless of' or 'irrespective of'.
によらず is a formal, written-style expression meaning 'regardless of' or 'irrespective of'. It is used to state that a condition or outcome does not depend on the noun that precedes it. For example, 年齢によらず means 'regardless of age'. This pattern is common in business, academic, and official contexts, and is rarely used in casual conversation. In speech, you would more likely hear にかかわらず or を問わず, but によらず has a slightly more literary nuance. It can also appear in the fixed form によらず, which is the negative of による (to depend on), so the nuance is 'not depending on'.