用于获取数字和小数的正则表达式

Question

I'm trying to access

1.20163

from the following:

1 British Pound Sterling = 1.20163 Euro

So far I have:

$exchange['rate'] = $xml->channel->item[15]->description;
$rate = preg_match('/^[0-9]{1,}$/', '', $exchange['rate']);

However, this seems to returns

1 British Pound Sterling = 1.20163 Euro

Any ideas?

Answer 1

I think you using preg_match wrong You want to extract the value of 1.20163 from the string, right? Then do this:

$s = '1 British Pound Sterling = 1.20163 Euro';
preg_match('/([0-9]+\.[0-9]+)/', $s, $matches);
$result = $matches[0];

You got your result in $result.

Answer 2

/^[0-9]{1,}$/

means you want to match a line containing only numbers. You wont get any match in your case. You also use preg_match in a wrong way. See the documentation .

Try something like:

$exchange['rate'] = $xml->channel->item[15]->description;
preg_match('/=\s*([0-9.]+)\s/', $exchange['rate'], $matches);
// the result will be in $matches
$rate = $matches[1];

Answer 3

Try

'/([0-9]{1,}\.[0-9]{1,}) /'

Match numbers then decimal then numbers then space.