CODEWITHSUNDEEP
phppreg-match
TrivoXx
TrivoXx

Reputation: 161

preg_match_all to check a special structure

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

Upvotes: 0

Views: 254

Answers (2)

Casimir et Hippolyte
Casimir et Hippolyte

Reputation: 89547

This script check the alternating vowel/consonant for each word and returns them:

$subject = <<<LOD
abacagopa
titot
blux
apocop
pipo
laek
LOD;

$pattern = '~
# definitions
(?(DEFINE)(?<vowel>[aeiou]))
(?(DEFINE)(?<consonant>[bcdfghjklmnpqrstvwyz]))

# pattern
\b\g<vowel>?+(?>\g<consonant>\g<vowel>)*+\g<consonant>?+\b

~ix';

echo preg_replace($pattern, '$0<br/>', $subject);

Upvotes: 0

AbsoluteƵER&#216;
AbsoluteƵER&#216;

Reputation: 7870

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';

Upvotes: 1

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