Extract decimal number and character (usage units) of a data usage string in PHP regex

Question

I have a string which returns data usage in B, KB, MB and so on. I want to separate the number and string part of it.

Ex : 14.5 MB - I want 14.5 and MB separately.

I tried using regex

'/(\d+)(\w)/'

but does not give the desired result.

Expected result

Array( [0] => 14.5, [1] => 'MB' )

Please refer this https://stackoverflow.com/questions/6278296/extract-numbers-from-a-string?answertab=oldest#tab-top — Shefali, Dec 19 '19 at 06:03

score 2 · Answer 1 · answered Dec 19 '19 at 05:57

You may try using preg_match_all here with the following regex pattern:

\b(\d+(?:\.\d+)?)\s*([KMGT]?B)\b

This matches a (possibly) decimal size, followed by a unit based in bytes.

$input = "Here are three sizes 14.5 MB, 10B, and 30.8 GB";
preg_match_all("/\b(\d+(?:\.\d+)?)\s*([KMGT]?B)\b/", $input, $matches);
print_r($matches[1]);
print_r($matches[2]);

This prints:

Array
(
    [0] => 14.5
    [1] => 10
    [2] => 30.8
)
Array
(
    [0] => MB
    [1] => B
    [2] => GB
)

BlackXero · Accepted Answer · 2019-12-19T06:08:02.943

2

You can make use of explode function if you are sure that your string will always contains space in between

$consumedData = '14.5 MB';
$withSeperate = explode(' ',$consumedData);
var_dump($withSeperate);

Output

Array([0] => 14.5, [1] => 'MB');

edited Dec 19 '19 at 06:08

answered Dec 19 '19 at 05:58

BlackXero

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What will happen if there is no space between the number and string! – Shefali Dec 19 '19 at 06:04
it will give you an array with count 1 and your string is on index 0 – BlackXero Dec 19 '19 at 06:07

Extract decimal number and character (usage units) of a data usage string in PHP regex

2 Answers2