preg_match_all来检查一个特殊的结构

Question

Hi i want to check with preg_match_all if a string consist of vowel and consonant. The structure should be as consonant|vowel|consonant|vowel.

For example:

xaxa
xuxu
baba
nunu

Answer 1

This is a bit tricky because, while my first instinct was to match vowels and then not-vowels, It also matched everything else. Then there are rules in English with y sometimes being a vowel.

This should get you there.

$string = "xaxa xuxu baba nunu nnnn";
$vowels = 'aeiouy';
$consonants = 'bcdfghjklmnpqrstvwxyz';
$pattern = "!([$consonants][$vowels][$consonants][$vowels])!i";
$found = preg_match_all($pattern,$string,$matches);

foreach ($matches[0] as $value){
    echo $value."<br />";
}

Strange thing about English is this will also match yyyy. If you wish not to treat y as a vowel, you can remove it from the group.

$vowels = 'aeiou';