如何从php中的字符串替换除数字（200,200.45等）之外的所有字符？

Question

I have few strings where i need to extract only the prices in php (which will obviously be numerals). The use cases are follows:

     1) Rs. 23,459.45                 desired output = 23459.45
     2)Our best price 23,459.45       desired output = 23459.45 

etc.

I gave the above use cases to give an idea that the preceding characters could be anything.

Please help!

Answer 1

How about:

$arr = array(
    'Rs. 23,459.45 ',
    'Our best price 23,459.45 ',
);
foreach($arr as $string) {
    $string = preg_replace('/^.*?(\d+),?(\d{3})(\.\d{2})?.*$/', "$1$2$3", $string);
    echo $string,"
";
}

output:

23459.45
23459.45