Wsrtjtyk

PHP preg_match_all() match all words except some word in Array.

$input = 'Lorem Ipsum is simply dummy text of the printing industry.';

$except = array('and', 'the', 'text', 'simply');

preg_match_all('/(?<match>w{3,}+)/', $input, $matches, PREG_PATTERN_ORDER);

print_r($matches['match']);

This give all word with unwanted words.

Array

(

    [0] => Lorem

    [1] => Ipsum

    [2] => simply

    [3] => dummy

    [4] => text

    [5] => the

    [6] => printing

    [7] => industry

)

Need to return only important words not adjective or preposition adjectives like other less important word in array.

$except = array('and', 'the', 'text', 'simply');

It would be better if we can use one function for this purpose.

Build a regex with a negative lookahead anchored at the word boundary:

'~b(?!(?:and|the|text|simply)b)w{3,}~'

See the regex demo

Details

• 
  b - a word boundary


• 
  (?!(?:and|the|text|simply)b) - no and, the, etc. as whole word is allowed immediately to the right of the current location


• 
  w{3,} - 3 or more word chars.

PHP demo:

$input = 'Lorem Ipsum is simply dummy text of the printing industry.';

$except = array('and', 'the', 'text', 'simply');

if (preg_match_all('/b(?!(?:' . implode('|', $except) . ')b)w{3,}/', $input, $matches)) {

  print_r($matches[0]);

}

Output:

Array

(

    [0] => Lorem

    [1] => Ipsum

    [2] => dummy

    [3] => printing

    [4] => industry

)

You can just apply array_diff to your result and the $except array:

$input = 'Lorem Ipsum is simply dummy text of the printing industry.';

$except = array('and', 'the', 'text', 'simply');

preg_match_all('/(?<match>w{3,}+)/', $input, $matches, PREG_PATTERN_ORDER);

print_r(array_diff($matches['match'], $except));

Output:

Array

(

    [0] => Lorem

    [1] => Ipsum

    [3] => dummy

    [6] => printing

    [7] => industry

)

demo on 3v4l.org

If you want the result array to be indexed from 0, use array_values on it i.e.

print_r(array_values(array_diff($matches['match'], $except)));

Output:

Array

(

    [0] => Lorem

    [1] => Ipsum

    [2] => dummy

    [3] => printing

    [4] => industry

)

You could use array_diff() to eliminate the words you have in $except:

$input = 'Lorem Ipsum is simply dummy text of the printing industry.';

$except = array('and', 'the', 'text', 'simply');

preg_match_all('/(?<match>w{3,}+)/', $input, $matches, PREG_PATTERN_ORDER);

$filtered = array_diff($matches['match'],$except);



var_dump($filtered);



// Output:

array(5) {

  [0]=>

  string(5) "Lorem"

  [1]=>

  string(5) "Ipsum"

  [3]=>

  string(5) "dummy"

  [6]=>

  string(8) "printing"

  [7]=>

  string(8) "industry"

}

Here is an example using array_diff() with explode().

$input = 'Lorem Ipsum is simply dummy text of the printing industry.';

$inputArray = explode(' ', $input);

$except = array('and', 'the', 'text', 'simply');

$results = array_values(array_diff($inputArray, $except));



echo '<pre>';

print_r($results);

echo '</pre>';

This will output:

 Array

(

    [0] => Lorem

    [1] => Ipsum

    [2] => is

    [3] => dummy

    [4] => of

    [5] => printing

    [6] => industry.

)