regardless of; irrespective of
Formal expression used to mean 'no matter what ... is'. Often follows a noun or noun phrase with の, as in ...の如何に関わらず. Common in written and formal spoken Japanese.
Anyone can apply, regardless of age.
結果の如何に関わらず、全力を尽くします。
I will do my best, irrespective of the outcome.
Standard kanji spelling using 如何. This is the most formal and common written form.
Variant with にかかわらず in kana. Slightly less formal but still common.
Combination of 如何 (いかん, 'how; what kind') + に + 関わらず (かかわらず, 'regardless of'). The kanji 如何 is a jukujikun reading for いかん.