从字符串中删除特定的单词/短语

Question

I want to remove some specific words and phrases from a string and I followed the discussion at Strip specific words from string .

I have created an array of forbidden words: $wordlist = array("bayes", "full", "greater than");

My example string is:

$string= "my bayesian results are full of bayes and greater than anything else";

If I apply the following code:

foreach ($wordlist as &$word) {
    $word = '/\b' . preg_quote($word, '/') . '\b/';
}
$string = preg_replace($wordlist, '', $string);

the result is: my bayesian results are of and greater than anything else [removed word: bayes, full]

whereas I want the result to be: my results are of and anything else [removed word: bayes, bayesian, full, greater than]

Note that I want that the forbidden word 'bayes' should remove the word 'bayesian' as well.

Answer 1

Try adding .*? before the ending boundary. It would match non-greedily till the boundary is reached.
Like this -

$word = '/\b' . preg_quote($word, '/') . '.*?\b/';
                                          ^^^

It outputs -

my  results are  of  and  anything else

Answer 2

Maybe this:

$string = "my bayesian results are full of bayes and greater than anything else";
$forbidden = array('/bayes(\w+)/','/full(\w+)/');
$result = preg_replace($forbidden , array(), $string);
print_r($result);

This code takes the string, tries to match an array of regex patterns ($forbidden) to the string and replaces them with an empty value.

It looks for words starting with bayes or full and stops looking when it finds whitespace.

Answer 3

First split the string into words then check each word against each banned word and remove it if necessary.

$string = "my bayesian results are full of bayes and greater than anything else";
$banned_words = array("bayes", "full", "greater than");
$words = explode(' ',$string);

foreach($words as $key => $word) {
    foreach($banned_words as $banned_word) {
        if(false !== stripos($word,$banned_word)) {
            unset($words[$key]);
            break;
        }
    }
}

$string = implode(' ',$words);

Finally remove any 1+ word full matches

print str_ireplace($banned_words,'',$string);