從字符串中提取美元金額 - PHP中的正則表達式

Question

我在爲所有可能的字符串可靠地執行此操作提出了挑戰。

這裏是$ str中的可能值：

有一個新的$ 66的目標價
有一個新的$ 105.20的價格目標
有一個新的$ 25.20的目標價

我想要一個新的$ dollar_amount從上面的示例字符串中提取美元金額。例如在上述情況下$ dollar_amount = 66/105.20/25.20。我如何可靠地做到這一點與PHP中的正則表達式？由於

Answer 1

preg_match('/\$([0-9]+[\.]*[0-9]*)/', $str, $match); 
$dollar_amount = $match[1]; 

很可能是最合適的一個

Answer 2

嘗試

#.+\$(.+)\s.+# 

---

Answer 3

試試這個：

if (preg_match('/(?<=\$)\d+(\.\d+)?\b/', $subject, $regs)) { 
    #$result = $regs[0]; 
} 

說明：

" 
(?<=  # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) 
    \$  # Match the character 「\$」 literally 
) 
\d  # Match a single digit 0..9 
    +  # Between one and unlimited times, as many times as possible, giving back as needed (greedy) 
(  # Match the regular expression below and capture its match into backreference number 1 
    \.  # Match the character 「.」 literally 
    \d  # Match a single digit 0..9 
     +  # Between one and unlimited times, as many times as possible, giving back as needed (greedy) 
)?  # Between zero and one times, as many times as possible, giving back as needed (greedy) 
\b  # Assert position at a word boundary 
" 

Answer 4

你需要這樣的正則表達式：

/(\$([0-9\.]+))/ 

什麼是滿足您的需求是由你的功能。

你可以找到那麼正則表達式函數PHP這裏：http://www.php.net/manual/en/ref.pcre.php