如何从字符串中获取数字/浮点数

Question

I want to get the (first) price of each string row, with out the $ sign and it could be an int or float and there could be more numbers in the row.

example:

$str_array=(
"Up to $1.9 per Install in RU",
"1.3 per iOS Install in UAE and SA",
"$2.1 per iOS and Android Registration in US",
"Up to $2.5 per Android Install in 7 countries",
"Up to $1 per iOS Install in SA"
);

Expected output:

1.9
1.3
2.1
2.5
1

I tried something like this

$re = '/[+-]?([0-9]*[.])?[0-9]+/';
$str = 'Up to $2.5 per Android Install in 7 countries';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
var_dump($matches);   

and i get this

[0] => Array
    (
        [0] => 2.5
        [1] => 2.
    )

[1] => Array
    (
        [0] => 7
    )

but its not working good. :(

Answer 1

Here is my version:

<?php
$data = [
    'Up to $1.9 per Install in RU',
    '1.3 per iOS Install in UAE and SA',
    '$2.1 per iOS and Android Registration in US',
    'Up to $2.5 per Android Install in 7 countries',
    'Up to $1 per iOS Install in SA'
];

array_walk($data, function(&$line){
    preg_match('/(\d+(?:\.\d+)?)/', $line, $tokens);
    if (count($tokens)>1) {
        var_dump(floatval($tokens[1]));
    }
});

The output obviously is:

float(1.9)
float(1.3)
float(2.1)
float(2.5)
float(1)