connective N2 common politewritten

を問わず — regardless of

を問わず・をとわず

Meaning

regardless of ~ / irrespective of ~ / no matter the ~ — a category makes no difference; anything in it qualifies equally

経験けいけんの有無うむを問とわず、誰だれでも応募おうぼできます。

Anyone can apply, regardless of whether they have experience.

Attaches to	Form	Example
Noun (a category) + を問わず	N + を問わず	年齢ねんれいを問とわず / 昼夜ちゅうやを問とわず

性別せいべつや国籍こくせきを問とわず、社員しゃいんを募集ぼしゅうしている。

We're recruiting staff irrespective of gender or nationality.

この施設しせつは季節きせつを問とわず楽たのしめる。

This facility can be enjoyed no matter the season.

問とう = 'to ask / call into question', so を問わず is literally 'without asking about ~'. Typical category nouns: 年齢ねんれい・性別せいべつ・国籍こくせき・経験けいけん・昼夜ちゅうや. Fixed phrase: 昼夜ちゅうやを問わず ('day and night').

Jengo shows を問わず the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Sources Compiled with reference to A Dictionary of Advanced Japanese Grammar.