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<?php
 
$price = 'Цена данного товара равна 355,55 рублей';
 
preg_match_all('#\d+[,.]\d+#', $price, $m);
print_r($m);

Success #stdin #stdout 0.02s 20520KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => Array
        (
            [0] => 355,55
        )

)

https://ideone.com/00OxN5

language:

PHP (php 7.3.5)

created:

visibility:

public

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