CODEWITHSUNDEEP
phpregexpreg-matchpreg-match-all
AnchovyLegend
AnchovyLegend

Reputation: 12538

store numbers found in a string in a an array with preg_match

I need to detect the number of times numbers are found within a string. If the string is "1 ssdsdsd 2" I need an array with [1,2] in it. If the string is "1 a" I need an array such as: [1].

With my below attempts, I am close, but I end up with duplicate numbers in there. Preg match seems more appropriate for what I need but duplicates matches as well.

Any idea why this is? I appreciate any suggestions on how to accomplish this.

input

  preg_match_all("/([0-9]+)/", trim($s), $matches); //$s = "1 2", output below
  //preg_match("/([0-9]+)/", trim($s), $matches); //$s = "1 .", outputs [1,1]

output

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
        )
    [1] => Array
        (
            [0] => 1
            [1] => 2
        )
)

Upvotes: 0

Views: 130

Answers (3)

mickmackusa
mickmackusa

Reputation: 47991

preg_split() is the ideal tool for this job because it will return a flat, indexed array of numbers.

Use \D+ to explode on one or more occurrences of non-numeric characters. Use the function flag to ensure there are no empty elements in the output array -- this eliminates the need to trim in advance.

Code: (Demo)

var_export(
    preg_split(
        '/\D+/',
        $s,
        0,
        PREG_SPLIT_NO_EMPTY
    )
);

Upvotes: 0

MonkeyZeus
MonkeyZeus

Reputation: 20747

You can opt to remove all non-digit chars and get the strlen()

echo strlen(preg_replace('/[^0-9]/', '', '1 ssdsdsd 2')); // 2 digits
echo strlen(preg_replace('/[^0-9]/', '', '1 ssd324sd567s.d6756 2')); // 12 digits
echo strlen(preg_replace('/[^0-9]/', '', '123456789')); // 9 digits

If you know that PHP string chars can be accessed by their index position then you can use something like:

echo preg_replace('/[^0-9]/', '', '9 ssdsdsd 5')[0]; // outputs 9 because the resulting string is '95' and position zero's value is 9

Upvotes: 0

Toto
Toto

Reputation: 91488

Remove the capture group,

preg_match_all("/[0-9]+/", trim($s), $matches);

The first element in matches array is the full match of the regex, the second one is the capture group.

Upvotes: 2

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