正则表达式中重音字母在字符串突变中的用法

如何修改字符串突变的正则表达式代码，使其也适用于重音字母？例如，"amor"正则表达式中的字符串突变应该与"āmōr"的字符串突变相同。我试着简单地包括重音字母，比如´(？<=[aeiouāīṓĕĭŏŭ](´，但这不起作用。

我的代码：

$hyphenation = '~
(?<=[aeiou]) #each syllable contain a vowel
(?:
    # Muta cum liquida
    ( (?:[bcdfgpt]r | [bcfgp] l | ph [lr] | [cpt] h | qu ) [aeiou] x )
  |
    [bcdfghlmnp-tx]
    (?:
        # ct goes together
        [cp] 'K (?=t)
      |
        # two or more consonants are splitted up
        'K (?= [bcdfghlmnp-tx]+ [aeiou]) 
    )   
  |
    # a consonant and a vowel go together
    (?:
        'K (?= [bcdfghlmnp-t] [aeiou])
      | 
        #  "x" goes to the preceding vowel
        x 'K (?= [a-z] | (*SKIP)(*F) ) 
    )
  |
    # two vowels are splitted up except ae oe...
    'K (?= [aeiou] (?<! ae | oe | au | que | qua | quo | qui ) ) 
)
~xi';

// hyphention
$result = preg_replace($hyphenation, '-$1', $input);