从特定字符后的字符串中获取数字并转换该数字

Question

我需要 regex php 方面的帮助。 如果在字符串中找到某个字符后的数字。获取该数字并在应用数学后将其替换为。像货币转换一样。

我应用了这个正则表达式https://regex101.com/r/KhoaKU/1

([^\?])澳元 (\d)

正则表达式不正确我想要所有匹配的数字，只有它匹配 40，但也有 20.00、9.95 等。我试图得到所有。并转换它们。

function simpleConvert($from,$to,$amount)
{
    $content = file_get_contents('https://www.google.com/finance/converter?a='.$amount.'&from='.$from.'&to='.$to);

     $doc = new DOMDocument;
     @$doc->loadHTML($content);
     $xpath = new DOMXpath($doc);

     $result = $xpath->query('//*[@id="currency_converter_result"]/span')->item(0)->nodeValue;
     return $result;
}

$pattern_new = '/([^\?]*)AUD (\d*)/';
if ( preg_match ($pattern_new, $content) )
{
    $has_matches = preg_match($pattern_new, $content);
    print_r($has_matches);
   echo simpleConvert("AUD","USD",$has_matches);
}

Answer 1

如果您只需要获取所有这些值并使用simpleConvert 进行转换，请使用正则表达式处理整数/浮点数，并在获取值后将数组传递给array_map：

$pattern_new = '/\bAUD (\d*\.?\d+)/';
preg_match_all($pattern_new, $content, $vals);
print_r(array_map(function ($a) { return simpleConvert("AUD", "USD", $a); }, $vals[1]));

见this PHP demo。

模式详情：

• \b - 前导词边界
• AUD - 文字字符序列
• - 一个空格
• (\d*\.?\d+) - 第 1 组捕获 0+ 个数字，可选的 . 和 1+ 个数字。

请注意，传递给simpleConvert 函数的$m[1] 包含第一个（也是唯一一个）捕获组的内容。

如果您想更改输入文本中的这些值，我建议在 preg_replace_callback 中使用相同的正则表达式：

$content = "The following fees and deposits are charged by the property at time of service, check-in, or check-out.\r\n\r\nBreakfast fee: between AUD 9.95 and AUD 20.00 per person (approximately)\r\nFee for in-room wireless Internet: AUD 0.00 per night (rates may vary)\r\nFee for in-room high-speed Internet (wired): AUD 9.95 per night (rates may vary)\r\nFee for high-speed Internet (wired) in public areas: AUD 9.95 per night (rates may vary)\r\nLate check-out fee: AUD 40\r\nRollaway beds are available for an additional fee\r\nOnsite credit card charges are subject to a surcharge\r\nThe above list may not be comprehensive. Fees and deposits may not include tax and are subject to change.";
$pattern_new = '/\bAUD (\d*\.?\d+)/';
$res = preg_replace_callback($pattern_new, function($m) {
    return simpleConvert("AUD","USD",$m[1]);
}, $content);
echo $res;

见PHP demo