Making WooCommerce coupon codes work with accented – special – characters

We were promoting our codes with capital letters as a style choice But while the code “burhi” worked the code BURHİ did not because Turkish, “i” and “İ” are considered as different characters, and the lowercase of “İ” is “i”, not “ı”. T.

The code should work for other international accented diacritic characters like umlauts

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